LIST OF COLORS. The following are some of the best known commercial coal-tar colors, their molecular formulas, and the principal methods employed in their manufacture.
Aldehyde Aniline Green below. Aniline Black, made by the oxidation of aniline with mineral salts.
Aniline Blue (triphenyl - rosaniline hydro chloride), C„H„N„Cl. made by heating rosani line. benzoic acid, and aniline, and subsequently adding hydrochloric acid.
Aniline Brown, Bismarck Brown, or Phenylene Brown (triamido-azobenzene), made by the action of nitrous acid on metaphenylene diamine.
Aniline Green, or Aldehyde Green, made by the action of ordinary aldehyde on an acid solution of rosaniline sulphate and the sub sequent addition of sodium hyposulphite.
Aniline name is applied to va rious compounds made by the notion of amido sulphonie acids on phenols. The name is often applied to the so-called Victoria Orange, Aniline Fuchsin below.
Aniline Scarlet, made by the action of diazoxylene on naphthosulphonie acid. Aniline Mauvein below.
Aniline Yellow (hydrochloride), en11,2N.C1. made by the action of nitrous acid on an excess of aniline.
Alizarin, made artificially by succes sive treatments of authraeene with ehromic acid and fuming sulphuric acid, and melting the product with potassium hydroxide. Among the dyes allied to alizarin are: Alizarin Black, Alizarin Blue, Aliz arin Orange, and Alizarin Violet, or Gallein, Avraniin (hydrochloride). made by the successive action of phosgene gas (carbon oxychloride) and ammonia upon dimethyl-ani line.
Aurantia (ammonium salt of hexanitro-di phenylamine), Ce2TT5N70,2--NH4. made by the action of nitric acid on methyl-diphenylamine.
Aurin, made by the action of oxalic and sulphuric acids on phenol.
Benzaldehyde Malachite Green be low.
Benzidinc Congo Red below.
Benzopurpurins, dyes of various scarlet shades. They are chemically allied to Congo Red (which see below), and are made by treating salts of toluidine (which is made from nitrotoluene.
and is analogous to benzidine) with nitrous :told. and combining the resulting salts with a- and fl-naplithylamine sulphonie acids.
Bismarck Aniline Brown above.
Blackley Indulin below.
Poneeaux below.
ChrysoIdin (hydrochloride), C,211,3N.C1, made by the action of diazo-benzene chloride on meta phenylene diamine in aqueous solution.
Congo Rcd, or Benzidine Red, O.II,AS,CooNa,, made by the action of nitrous acid and then of sodium naphthionate on benzidine hydrochloride.
Eosin, or made by the action of bromine on fluorescein.
Erythrosin, made by the action of iodine on fluorescein.
Fluorescein, made by the action of plithalie acid anhydride on resorcin.
Fuchsia, Rosaniline Hydrochloride, Magenta, or Aniline Red, made by the oxidation of toluidine and aniline in the presence of acids.
Alizarin above.
Methyl Orange below. text of the article above.
Indulin, or Blackley Blue. made by heating aniline salts with amidonzobenzene. Fuehsin above.
Malachite Green, Benzaldehyde Green, or Vic toria Green, made by the condensation of benzahlehyde with dimetbyl aniline, and the subsequent addition of hydro chloric acid and zinc chloride.
Martins's Yellow, made by the action of nitric acid on a-naphthol-monosnl phonic acid.
Man vein (hydrochloride), or Aniline Violet, made by the action of chromic acid on aniline containing some toluidine.
Methyl Orange, made by the successive action of nitrous acid and methyl aniline upon para-amidobenzene-sulphonie acid; it is the sodium salt of helianthin.
Methyl Violet, made by oxidizing di methyl-aniline with metallic salts.
1/ethylene Blue, C,,,11,,N,SC1, made by heating amido-dimethylaniline with sulphide of iron.
Naphthol Yellow, C„II,N,O,SK, made by the action of nitric acid on a-naphthol-trisulphonic acid.
Nigrosin, made by heating aniline salts with nitrobenzene.