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Mercury Chromate
Mercury Chromate. On Treating Dissolved Mercurous Or Mercuric Salts With A Solution Of Potassium Chromate Bright Red Precipitates Are Obtained, Similar To Ver Milion. This Colour Is Best Obtained By Precipitating Mercuric Nitrate With Potassium Chromate, Followed By Washing. The Mercury Chromate, Both In The Dry State And When Ground ...

Mixing The Natural Mineral
Mixing The Natural Mineral Colours. As With Artificial Mineral Colours, The Attainment Of A Certain Shade Often Entails The Mixing Of Two Or More Colours ; In Fact, It May Be Said That This Operation Is More Important In The Case Of The Natural Mineral Colours Than With The Chemical ...

Moulding The Colours
Moulding The Colours. It Has Always Been The Custom In The Manufacture Of Colours To Place The Finished Articles On The Market In Special And More Or Less Attractive Form, Usually With The Object Of Doing A Larger Trade In New Varieties. How Far Such A Course Was Successful In ...

Mountain Blue Lime Blue
Lime Blue, Mountain Blue, Neuwied Blue. Although These Colours Are Now Very Rarely Met With In Commerce, And Therefore Manufactured Only In Very Small Quantities, They Are Sufficiently Interesting To Justify A Brief Description. Lime Blue, Which Is Now Replaced By The Far More Powerful And Equally Permanent Lakes From ...

Mss
Mss. To Bring An Organic Colouring Matter Into A Suitable State For Dyeing Pur Poses It Must Be In The Finest Possible State Of Division, Viz., Dissolved In Water Or Alcohol, These Being The Principal Solvents For All Organic Colouring Matters. If Small Pieces Of Cotton, Wool, And Silk Are ...

Naphthols
Naphthols. Of The Two Known Naphthols, Betanaphthol Is By Far The More Important. The Colours It Produces Are Not Only Far Brighter, But Also Much Faster To Light And Water, Whereas The Insoluble Naphtholazo Colours From Alphanaphthol Are Generally Darker, Of A Dull Shade, And Partly Less Fast To Light. ...

Naples Yellow
Naples Yellow. (neapelgelb, Jaune De Naples, Giallolino). Naples Yellow Is A Combination Of Antimonic Acid With Lead Oxide, The Shade Depending On The Presence Of A Larger Or Smaller Excess Of Free Lead Oxide. Apart From Its Sensitiveness To Gases Containing Sulphide Sulphur, Naples Yellow May Be Considered A Very ...

Neuwied Green
Neuwied Green. This Colour, Formerly Very Much In Use, Especially As A Water Colour, Has At Present Almost Entirely Disappeared From The Market, As Well As Its Various Derivatives, And Is Only Asked For In Isolated Cases And For Special Purposes. It Is Formed Of A Mixture Of Emerald Green ...

Nitro Derivatives
Nitro Derivatives. These Contain One Or More Nitro Groups, And Hilve The Special Property Of Detonating On Ignition. Their Number Is Very Large, And They Are All Acid Colouring Matters. Typical Representatives Of The Group Are, First Of All, Trinitrophenol= Picric Acid, Formed By Treating Phenol And Other Organic Bodies- ...

Olive Green
Olive Green. Within The Last Few Years Olive Greens Have Come So Much Into Favour, Not Only For Wall-paper Designs, But Also For Distemper And Dil Paints For Interior And Outdoor Use, That One May Almost Speak Of A " Mode Colour " In This Connection. The Variety Of Olive ...

Orange Chronic
Orange Chronic. For Producing Orange Chrome The Same Raw Materials Can Generally Be Used As For The Chrome Yellows Already Mentioned. The Composition Of Orange Chrome, Which In Its Purest State (chrome Red) Has The Formula Indicates The Desirability Of Using Basic Lead Acetate For This Purpose. Neutral Lead Acetate ...

Organic Colouring Matters
Organic Colouring Matters. The Materials For Colour Making We Have Hitherto Taken Into Considera Tion Are Exclusively Of An Inorganic Nature, Their Components Being Derived From The Mineral Kingdom, Either Directly Or By The Aid Of Chemical Processes. The Organic World, Too—the Animal Or Vegetable Kingdoms— Contributes To The Colour ...

Orpiment Or Kings Yellow
Orpiment Or King's Yellow. The Product Known Under This Name Is Arsenic Tri-sulphide, With The Formula As,s,. It Is Also Found Native, The Mineral Being Called Orpiment, Or Auripigment. It Is Obtained Artificially By Melting Arsenic Acid With Sulphur, Or By The Distillation Of A Suitable Mixture Of Pyrites And ...

Other Lead Pigmants
Other Lead Pigmants. Besides The Basic Carbonate Certain Other White Compounds Of Lead Are Used As Pigments, Though Only To A Small Extent. Nevertheless, They Will Now Be Briefly Mentioned Here. Pattinson's White Lead Or Lead Oxy-chloride, Pbc1,pbo, Is Made By Pre Cipitating A Hot Concentrated Solution Of Lead Chloride ...

Oxidation With Chrorine
Oxidation With Chrorine. The Brightest Prussian Blues Are Undoubtedly Obtained By The Oxidation Of Ferrous Ferrocyanide With Chlorine. These Are Not Only Of Bright Indigo Shade With A Slight Reddish Tint, But They Also Exhibit The Highest Metallic Coppery Lustre Of Any, Since The Direct Preparation Of Chlorine And Its ...

Oxidation With Ferric Sulphate
Oxidation With Ferric Sulphate. Ferric Sulphate, Not Being A Commercial Article, Must Be Produced In The Works. There Are Different Methods Of Producing It, But Only Two Will Be Considered Here As Being The Most Suitable For The Process In View. The First Method, Depending Upon The Oxidation Of Ferrous ...

Oxidation With Sulphuric And
Oxidation With Sulphuric And Nitric Adds. For Every 100 Parts Of Yellow Prussiate, 90 Of Ferrous Sulphate (copperas), 40 Of Sulphuric Acid (66° B.), And 75 Of Nitric Acid (40° B.) Are Employed. The Ferrous Ferrocyanide Paste, Treated As Described, Is Placed In A Tank Of Medium Size And Stirred ...

Persian And Yellow Berries
Persian And Yellow Berries. Persian Berries Are The Dried Half-ripe Berries Of Various Species Of Rhamnus, And About The Size Of Peas. This Plant Grows As A Bush, Especially In Asiatic Turkey, And Was Formerly Also Cultivated In Hungary, Spain, France, And Italy. The Berries Have A Bitter Taste, An ...

Popular Chrome Green
Popular Chrome Green. (green Vermilion, Chromgriin, Vert De Chrome). The So-called Chrome Greens Are Manufactured And Used In Larger Quantities Than Any Other Green Mineral Colours. They Are Exclusively Obtained By Mixing Chromes Of Definite Shades With Prussian Blue, Finely Ground Barytes, Which Is Taken Up In Almost Unlimited Quantities ...

Potassium Compounds
Potassium Compounds. Potassium Hydroxide (caustic Potash ; Koh ; Mol. W., 56). This Is A White, Hard, Opaque Body, With A Crystalline Fracture. It Liquefies Readily, Deliquesces In Air, And Forms A Solution With The Water So Absorbed. At The Same Time It Absorbs Carbonic Acid From The Atmosphere, And ...

Precipitated By Lead Salts
Precipitated By Lead Salts. Though The Group Of Resorcin Colouring Matters, Which Here Has To Be Taken Into Consideration, Is Small, They Furnish A Considerable Series Of Very Bright Lakes, Which Play A Part No Less Important Than, For Instance, The Far More Numerous Azo-colour Lakes. In Consequence Of The ...

Precipitation With Soap Or
Precipitation With Soap Or Turkey Red Oil. This Method Is Based On The Double Reaction Of Colour Bases With Oleic, Stearic, And Palmitic Acids To Form Corresponding Insoluble Salts, Which Are Mostly Very Bright In Shade, And, In Consequence Of Their Fine Division, Envelop Carriers Like The Tannates. The Character ...

Precipitation With Sodium Or
Precipitation With Sodium Or Magnesium Sulphate. These Precipitating Reagents Are Used In The Same Manner As Described Above, Except That It Should Be Noted That Hot Precipitation Greatly Facilitates The Subsequent Washing Of The Precipitate, Which, For Reasons Already Men Tioned, Here Requires A Much Longer Time. In This Process ...

Precipitation With Sulphuric Acid
Precipitation With Sulphuric Acid. The Precipitation Tank, Charged With The Solution Of Barium Chloride, Is Provided With Wooden Stirrers, Which, In View Of The Large Quantities Of Acid Used, Should Not Have Any More Metal Fittings Than Absolutely Necessary In The Parts Immersed In The Liquid. The Weighed Quantity Of ...

Preparation Of Raw Materials
Preparation Of Raw Materials. The Processes, Apparatus, And Machines Used In Colour-making, And Described In The Following Chapter, Can, Of Course, Only Be Dealt With In Relation To The General Manufacture And Treat Ment Of Colours. Where Special Arrangements Of No General Application Are Needed They Will Be Mentioned In ...

Preparation Of The Dino
Preparation Of The Dino Solution. The Amido Bases Are Diazotised In The Colour Works In Varying Serial Order, So Far As The Several Operations Are Concerned, The Main Object Being To Minimise The Loss Of Nitrous Acid. This Result Is, However, Very Seldom Achieved, The Acid Being Able To Escape ...

Preparing The Betanaphthol Solution
Preparing The Betanaphthol Solution. This Can Be Done Direct In The Larger Working Tank. For This Purpose The Tank Is Filled With About 44 Galls. Of Water, And 161 Lbs. Of Betanaphthol, Mixed With Water To A Suitable Paste, Are Afterwards Added Through A Sieve To Secure Uniform Distribution. The ...

Producing Lakes In The
Producing Lakes In The Laboratory The Methods Of Testing For Coal-tar Colouring Matters On The Fibre As Well As In The Form Of Lakes Are Very Incomplete, Inasmuch As The Colouring Matters Do Not All Give Equally Favourable Results, No Simple Characteristic Reactions Capable Of Sharply Differentiating The Individual Members ...

Properties And Applicability Of
Properties And Applicability Of Colours. Whilst The Detailed Characterisation Of The Various Colouring Matters And Pigments Must Be Postponed Until We Come To Deal With Them Separately, Some General Introductory Remarks May Now Be Given As Facilitating Com Prehension Of The References That Will Then Be Made In The Text. ...

Properties Manufacture
Manufacture, Properties, Qualitative Examination. Since The Practical And Advantageous Application Of Chemical Reactions Is Usually The Basis Of The Manufacture Of Mineral And Lake Colours, A Thorough Knowledge Of The Raw Materials Used For This Purpose And Of Their Chemical And Physical Qualities Is Essential. Without This Knowledge It Would ...

Properties Of White Lead
Properties Of White Lead. According To Its Chemical Composition, White Lead Consists Of Basic Lead Carbonate Of The Formula 2pbco,pb(oh),. The Content Of Lead Oxide Varies In The Different Brands Between 88.75 And 86.78 Per Cent., The Carbon Dioxide Content Between 11 And 16 Per Cent., The Moisture Content In ...

Quercitron
Quercitron. Quercitron Is The Dried Ground Bark Of Certain Species Of Oak, Quercus Linctoria (nigra), Q. Digitata, Q. Trifida, Inhabiting North America (pennsyl Vania, Georgia, Carolina), Which Were Formerly Also Cultivated In Europe, Especially In France. Quercitron Comes Into The Market As A Powder, And As An Extract Of About ...

Red Antimony Colours
Red Antimony Colours. Antimony Vermilion Antimonzinnober, Vermilion D'anlinwine). This Pigment Also Has Lost Much Of Its Former Importance, Being Replaced By Aniline Lakes Of Much Greater Brightness And Permanence. Its Prepara Tion Will Therefore Be Only Briefly Described Here. The Method Of Kopp (dingl. Journ., Cliv., P 296) For Making ...

Red Cobalt Colours
Red Cobalt Colours The Red - Or Pink-coloured Cobalt Compounds Are More Of Scientific Interest, Being Too Dear For Technical Use. According To Gentele, When Cobaltous Arsenate (chaux Metallique), Of A Violet Shade, Is Very Strongly Heated For Some Time A Violet-coloured Mass Is Formed, Representing, When Finely Ground, A ...

Red Earth Colours
Red Earth Colours. Besides The Natural Vermilion, Now Entirely Displaced By The Artificial Product, The Number Of Native Red Minerals Suitable For Pigments, And There Fore Red Earth Colours In The Proper Sense Of The Word, Is Very Small, Being Confined To The Red Clays Containing More Or Less Ferric ...

Red Lakes
Red Lakes. Compared With The Above-mentioned Yellow And Orange Lakes, The Number Of Red Lakes Is Relatively Much Larger, And Their Manufacture And Consumption Are So Great That The Other Lakes—viz., The Blues And Violets— Cannot Vie With Them In This Respect. The Chief Colouring Principles Used For Manufacturing Red ...

Red Mercury Colours
Red Mercury Colours. Vermilion (zinnober, Vermilion, Cinnabar). Vermilion Has Been Used As A Colour From The Earliest Times. As Far Back As 400 Years B.c. It Was Mentioned As A Colour Used By The Egyptians For Painting Pictures Of The Gods (" Sapienia," Chap. Xiii. 14). According To D. Chimchi, ...

Red Mineral Colours
Red Mineral Colours A Certain Number Of Red Coloured Inorganic Compounds Suitable As Pigments Have Been Known From The Earliest Times. At Present, However, Only Three Of These Colours Are Practically Used. These Are Red Lead, Vermilion, And Chrome. Red-. Whereas The First-named Two Pigmentniiive Been Used In Practice For ...

Red Ochres
Red Ochres. Occurrenceand Properlies. Compared With The Yellow Ochres, The Red Kinds Are Of Subordinate Importance. With Regard To Shade, They Come Between The Yellow Ferric Hydroxides And The Pure Ferric Oxide Colours And They Can Be Prepared, As Already Mentioned, By Calcining The First-named, Though In This Case They ...

Screw Mills
Screw Mills. These Belong To The Class Of Roller Mills, And Are Suitable For Crushing Both Soft And Hard Materials. They Consist Of A Strong Casing Lined With Removable Chilled Cast Plates. Connected With The Casing Is A Grating Of Steel Bars, Which Can Be Adjusted Relatively At Pleasure By ...

Sifting Grinding
Grinding, Sifting, Mixing Ultramarine. The Dried Ultramarine Is In The State Of More Or Less Hard Lumps, And Must Next Be Ground And Sifted To Obtain Powder For Sale, This Being The Only Marketable Form Of The Product. This Operation, Too, Is Carried Out In Various Ways In Practice. All ...

Sifting Machines
Sifting Machines. The Colours After Being Pulverised In A Crushing-machine Must Usually Be Sifted To Obtain The Highest Possible Degree Of Fineness, Or At Least Uniformity, Of Grain By Eliminating The Coarser Particles. Here Again A Careful Differentiation Must Be Made Between The Large Number Of Forms Available, According To ...

Smelt
Smelt. (smite, Eschel). The Oldest Representative Of The Blue Cobalt Colours, Smalt, Was Already Known In The Middle Of The Sixteenth Century, At Which Time It Was Discovered By Schurer. When He Sold His Secret To England The First Smalt Mills Were Erected In This Country, But All The Cobalt ...

Sodium Compounds
Sodium Compounds. Caustic Soda (naoh ; Mol. W., 40). Caustic Soda Is Very Similar To Caustic Potash, But Deliquesces Still More Readily In The Air. From Very Strong Solutions Rhombic Prisms Of Crystalline Caustic Soda, Of The Formula 2naoh + Melting At 6° C., Separate At A Low Temperature. In ...

Soluble Prussian Blue
Soluble Prussian Blue. For The Manufacture Of Soluble Prussian Blue Briicke Gives The Following Recipe : A Solution Containing 271 Parts Of Potassium Ferrocyanide Per 1000 Is Mixed With Twice Its Volume Of A Cold Saturated Solution Of Glauber Salt. A Second Mixture Is Made Of A Similar Solution Of ...

Supervision Laboratory
Laboratory, Supervision, Analysis An Efficient Colour Manufactory Nowadays Must Have A Well-equipped Laboratory, Provided With The Necessary Apparatus And Resources For Render Ing A Quick Control And An Effective Management Of The Work Possible. The Laboratory Should Also Enable The Necessary Trials Of Any One Pro Duct To Be Made ...

Tests For Acids
Tests For Acids. In Colour Manufacture Really Pure Acids Are Rarely Used, And In Most Cases Any Admixtures Or Adulterations Of The Technical Acids Are Of No Importance. 1. Sulphuric Acid Test For Lead. The Metal Can Only Be Present As A Sulphate. The Acid Is Diluted (if Concentrated) With ...

The Ammonia Soda Process
The Ammonia Soda Process. This Procedure Is Of Recent Date. A Solution Of Common Salt Is Treated With Ammonium Bicarbonate Under High Pressure, Sodium Bicarbonate And Sal Ammoniac Being Formed : Nac1+ Nahco,+ Nh,c1. The Sodium Bicarbonate Is Converted, By Heating, Into The Neutral Car Bonate, True Soda : 2 ...

The Chief Processes In
The Chief Processes In The Treatment Of Natural Mineral Colours. Levigation Process And Apparatus. The Levigation Process, The Principle And Object Of Which Have Been Already Explained (p. 348) In The Description Of The Preliminary Experiment, Generally Requires Mechanical Power For Its Successful Application; And The Rapidity And Economy Of ...

The Dutch Process
The Dutch Process. The Chief Factor In This Process Is The Form In Which The Metallic Lead Is Used, Inasmuch As A Very Large Surface Is Desirable To Facilitate The Action Of The Substances Decomposing The Metallic Lead—viz., Acetic Acid And Carbonic Acid, As Well As The Oxygen Of The ...

The French Process After
The French Process After Thenard. When Carbon Dioxide Is Passed Into A Saturated Solution Of Basic Lead Acetate, Two Molecules Of Lead Will Be Precipitated As White Lead (basic Lead Carbonate), Whilst Neutral Lead Acetate Remains In Solution. This Solution Of Sugar Of Lead, On Being Treated With Litharge And ...

The Jane Sifling Machine
The Jane Sifling Machine. This Sifter Consists Of Two Or More Superimposed Circular Screens, The Number Being Suitably Increased Or Lessened According To The Capacity Or The Class Of Product Desired. The Material To Be Sifted Is Introduced Through A Central Hopper, And Falls On To A Disc Which Distributes ...

The Manufacture Of Lithopone
The Manufacture Of Lithopone By The Wet Method. The Precipitation Of The Solution Of Barium Sulphide With Zinc Sulphate Is Usually Performed In Very Large Tanks. The Barium Sulphide From The Calcina Tion Process Is Washed As Already Described In Connection With The Production Of Blanc Fire, And Therefore The ...

The Native Barium Compounds
The Native Barium Compounds. Barytes Occurs Generally As More Or Less Large Masses Only In The Primitive Rocks Or In Those Of Volcanic Origins. In Germany Especially It Is Found In Fairly Considerable Quantities And Mined In Several Places. It Is Chiefly Found In The Oden Forest (hesse), Near Neustadt, ...

The Native Calcium Compounds
The Native Calcium Compounds. Gypsum (calcium Sulphate, Lenin, Annalin, Leichtspath ; Caso, + 211,0). Gypsum Occurs In Great Abundance In Many Parts Of The World, And Forms (either Alone Or With Anhydrous Calcium Sulphate) Not Merely Important Strata And Rocks, But Sometimes Whole Mountains. Two Different Principal Con Ditions Of ...

The Native Compounds Of
The Native Compounds Of Iron. Ochre (yellow Earth, Chamois, Chinese Yellow, 4.c.). Ochres Vary Greatly In Form And Composition, And Occur Native In Very Large Quantities. They May Generally Be Regarded As Decomposition Pro Ducts Of The Various Kinds Of Ferruginous Felspar And Similar Minerals. Many Ochres Must Be Considered ...

The Native Silicates
The Native Silicates. Magnesium Silicate. Occurrence. This Occurs Native In Various Very Important Minerals, The Best Known Of Which Are : (a) Olivine, Mg,sio, Or 2mgo.sio„ Or Chrysolite (rhombic Crystals), The Magnesia Being Partly Replaced In Some Specimens By Ferrous Oxide. (b) Serpentine, 3mgo.2sio, With 2-3h,0 Or + (2-3)h,0 (also ...

The Nomenclature Of The
The Nomenclature Of The Colours. It Is Advisable To Say A Few Words About The Nomenclature Of Colours, Although Unfortunately No Systematic Classification Has Been Adopted In This Respect. On The Contrary, The Names Of Colours Have Been Quite Arbitrary, And Not Only Manufacturers, But Merchants Too, Think Themselves Entitled ...

The Uses Of Colours
The Uses Of Colours. The Manufactured Colours Are Chiefly Used In Two Different Ways : Either They Are Incorporated With A Vehicle And Spread Over The Surface Of The Article To Be Coloured (" Painting "), Or They Are Introduced—alone Or In Association With Other Substances—into The Mass Of The ...

The Washing Process
The Washing Process. After The Colours Are Made They Have To Be Washed More Or Less Repeatedly To Remove The Soluble By-products Formed In The Process Of Precipitation. Water Is Preferably Used, Other Liquids Being Rarely Employed. The Water May Be Cold Or Hot, According To The Mode Of Manufacture ...

The Yellow Mineral Colours
The Yellow Mineral Colours The Following Are The Most Important Representatives Of This Group. They Are Applied To A Large Variety Of Technical Uses At The Present Day. 1. Zinc A Combination Of Metallic Zinc With Chromic Acid. It Probably Has The Formula (i.e., Is A Double Salt). 2. Neutral ...

Tin Compounds
Tin Compounds. Stannous Chloride (tin Dichloride, Tin Sall ; Snci, + 2h,0 ; Mol. W., 225). Forms Small, Clear, Monoclinohedral Prisms, Readily Soluble In A Little Water. The Dilute Aqueous Solution Decomposes, With Formation Of A Basic Salt, Sn(oh)ci, Producing A Milk-white Appearance. This Circumstance Arises When Water Containing Air ...

Tin Sulphide
Tin Sulphide. The Appearance—similar To Metallic Gold—of Tin Sulphide Classes It Rather With The Bronzes Than With The "colours," And, In Fact, Before The Introduction Of Metallic Bronze Powders It Was Used Exclusively To Imitate Gilding On Wood, Metal, Plaster, &c. In An Unpowdered State Tin Sulphide Forms Flakes Or ...

Translator
Translator]. Madder Is The Dried And Ground Root Of Rubin Tinctorium And Other Species Of The Rubiaceir, Containing Several Different Colouring Matters. The Prin Cipal One Is Ruberythric Acid, Which Is A Glucoside Of Alizarine, And Was Isolated By Rochleder In 1851, By Extracting Madder With Hot Water. When Rube ...

Treatment With Alcohol
Treatment With Alcohol. A Small Portion Of The Lake In Question Is Sprinkled With Absolute Alcohol In A Test-tube, And The Mixture Is Slightly Warmed For Some Time. If A Coloured Solution Is Formed, It Is Filtered From The Residue, And The Clear Liquid Is Examined By Transmitted And Reflected ...

Treatment With Caustic Soda
Treatment With Caustic Soda. Another Sample Of The Lake To Be Tested Is Warmed With 20 Per Cent. Caustic Soda, Which Generally Decomposes The Lake Completely. In This Case Also Certain Of The Carrier Ingredients, Especially Alumina, Are Dissolved, Whilst Others, Such As Barytes, Gypsum, Artificial Barytes, Lead Sulphate, Clay, ...

Treatment With Strong Sulphuric
Treatment With Strong Sulphuric Or Hydrochloric Acid. When The Alcoholic Extract Leaves A Perfectly Colourless Residue, This Latter Is Tested By The Usual Methods Of Analysis. A Coloured Residue From The Alcoholic Extraction, Or—when The Colouring Matter Is Totally Insoluble In Alcohol—the Pure Lake, Is Treated With Strong Sulphuric Acid, ...

True Lampblack
True Lampblack. Lampblack Is Superior In Fineness To Flame Black, And Is Also Much Softer And Of A Deeper Colour. Lampblack Is Produced From Oil In Wick Lamps Similar In Shape To The Ordinary Household Petroleum Lamp. Large Flat Burners Are Used, Generally Two In Each Lamp, The Wick Being ...

Ultramarine
Ultramarine. The Term " Ultramarine " Was Originally Used For A Deep Blue Pigment Obtained In The Early Middle Ages, By A Very Complicated Process, From Lapis Lazuli, A Semi-precious Stone That Is Still Greatly Appreciated. This Mineral Was Mechanically Ground, Mixed With A Special Lute, And Afterwards Wrapped In ...

Waras
Waras. The Husks Of A Bushy Plant, Flemingia Congesta, Growing In India And Africa, Contain A Red Resinous Powder, Which In The Dry State Forms The Colour-drug Waras. Waras Is Extracted With Carbon Disulphide, Dried, And Afterwards Treated With Hot Chloroform For Some Time, The Liquid Depositing A Red Precipitate ...

Woad
Woad. (luteolin, Wau). This Is Derived From A Species Of Reseda, R. Luteola, Growing In Central Europe (germany, England, France), And Formerly Cultivated To Some Extent. The One-year-old Plants Are Collected And Dried In The Air, And Contain (especially In The Flowers) The Colouring Matter Luteolin. Is Recovered From The ...

Yellow Lakes Lakes Precipitated
Lakes Precipitated By Barium Chloride, Yellow Lakes. For Reasons Very Easy To Understand, Yellow Lakes Are Made And Used As True Pigments To A Smaller Extent Than Any Other Lakes, Owing To The Superior Advantages Presented By The Absolutely Fast And Very Bright Lead Chromates Of High Covering Power And ...

Zinc Compounds
Zinc Compounds. Zinc Sulphate (znso, + ; Mol. W., 287). Occurs Sometimes Native As A Secondary Product From The Oxidation Of Zinc Ores. The Artificial Product Generally Forms Large Vitreous, Transparent Crystals Of The Rhombic System, Readily Soluble In Water. From Aqueous Solution It Crystallises Easily At C., But The ...

Zinc Green
Zinc Green. The So-called Zinc Greens Share The Popularity Of Chrome Greens For Outdoor Use As Oil Paints, On Account Of Their Brightness Combined With Cheapness. They Are Colour Mixtures Of Zinc Chrome, Barytes, And Prussian Blue, And Are Made On Similar Lines To The Chrome Greens, Except That The ...

Zinc Grey
Zinc Grey. A Number Of Very Different Products Are Put On The Market, All Having The Same Name, Zinc Grey. Originally The Fine Metallic Powder Obtained In Zinc Furnaces Was Collected And Used As A Grey Pigment And Called Zinc Grey, But Afterwards Grey-coloured Zinc Oxide Adulterated By Admixtures Of ...

Zink Yellow
Zink Yellow. (zinc Chrome, Zinkgelb, Janne De Zinc). The Application Of Zinc Chromate As A Yellow Colour Is Of Only Recent Date, And Is Not Met With In Trade To Any Great Extent As A Separate Pigment, The Greater Part Being Employed For Mixing With Prussian Blue To Produce The ...