derivatives of benzidin- or tolidin-meta-disulphonic acid, having the following general formula:

in which formula X means hydrogen atoms which can be replaced by the methylic group.

The new coloring-matters are, in the shape of their alkaline salts, brownish powders soluble in water and in concentrated sulphuric acid with a yellow color and yielding upon reduction with stannous chlorid and hydrochloric acid the diamido-diaryldisulphuric acids of the above-given general formula and amido-methylphenylpyrazolon and amido-alphamethylindol. They dye wool from acid-baths yellow shades fast to milling.

YELLOW TETRAZO DYE.

Hugo Witter, of Elberfeld, Germany, assignor to Farbenfabriken of Elberfeld Co., of New York, N. Y. Patent No. 791,526, dated June 6, 1905.

This invetion relates to the production of new tetrazo dyestuffs which dye wool from acid-baths yellow shades fast to milling and do not stain the interwoven white cotton or wool.

The new dyestuffs can be obtained by combining with two molecular proportions of alpha-methylindole (methyl-ketole) one molecular proportion of the tetrazotized derivatives of benzidin or tolidin-meta-disulphonic acid having the following general

formula:

NH2

SO2H SO H

X

-NH2

in which formula X means hydrogen atoms, which can be replaced

by the methylic group.

The new coloring-matters are after being dried and pulverized in the shape of their alkaline salts brownish-yellow powders soluble in water and in concentrated sulphuric acid with a yellow color and yielding upon reduction with stannous chlorid and hydrochloric acid the diamidodiaryldisulphonic acids having the above-given general formula and amidomethylketol. They dye wool from acid-baths yellow shades fast to milling.

BROWN ANTHRACENE DYE.

René Bohn, of Mannheim, Germany, assignor to Badische Anilin und Soda Fabrik, of Ludwigshafen-on-the-Rhine, Germany. Patent No. 791,869, dated June 6, 1905.

In the specification of Patent No. 767,259 there is described the production of gray coloring-matters which possess properties similar to those of indanthrene and flavanthrene. These coloringmatters can be obtained by melting diamidoanthrachinons or their sulpho-acids with caustic alkali, and they can only be used for dyeing and printing when a special process is employed.

It is now discovered that coloring-matters which belong to the same generic class and which, with the exception of their shades, possess properties similar to those of the afore-mentioned coloringmatters can be obtained by melting with caustic alkali the formaldehyde derivatives of diamidoanthrachinons. The compounds at present employed are the formaldehyde derivatives of 1.5 and of 1.8 diamidoanthrachinon. Whereas the coloring-matters produced according to the specification of Patent No. 767,259 yield from reddish-gray to greenish-gray shades on cotton, the new coloring-matters produce brown shades.

The coloring-matters in the form of pastes possess a reddishbrown color, but when dry form black powders which are practically insoluble in the usual solvents. They are, however, soluble in concentrated sulphuric acid, yielding yellowish-brown solutions. With reducing agents, such as sodium hydrosulphite, in the presence of caustic alkali, they give brown to red vats which dye vege

table fibre substantively, yielding reddish-brown shades, which when exposed to the air, turn brown.

BLUE-BLACK AZO DYE.

Martin Herzberg, of Elberfeld, Germany, assignor to Farbenfabriken of Elberfeld Co., of New York, N. Y. Patent No. 792,032, dated June 13, 1905.

The inventor has found that new and valuable azo dyestuffs are obtained by first combining the diazo compounds obtainable from mononitroacetyl-para-phenylenediamin having the formula:

with dioxynaphthalene disulphonic acids and then splitting off from the resulting dyestuffs the acetyl group by saponification.

The new dyestuffs are in the shape of their alkaline salts dark powders soluble in water. They yield upon suitable treatment with stannous chlorid and hydrochloric acid triamidobenzene and amidodioxynaphthalene disulphonic acids and dye unmordanted wool from acid-baths black shades.

The claim specifies the product so obtained from 1.8 dioxynaphthalene 3.6 disulphonic acid.

BLACK AZO DYE.

Martin Herzberg, of Elberfeld, Germany, assignor to Farbenfabriken of Elberfeld Co., of New York, N. Y. Patent No. 792,033, dated June 13, 1905.

The inventor has found that new and valuable azo dyestuffs are obtained by first combining the diazo compounds obtainable from mononitroacetyl paraphenylenediamin, having the formula

with admidonaphthol disulphonic acids in acid solution and then splitting off from the resulting dyestuffs the acetyl group by saponification.

The new dyestuff's are in the shape of their alkaline salts dark powders soluble in water. They yield upon suitable reduction with stannous chlorid and hydrochloric acid triamidobenzene and diamidonaphthol disulphonic acids. They dye unmordanted wool from acid-baths black shades.

The claim specifies the product so obtained from 1.8 amido naphthol 3.6 disulphonic acid.

AZO DYE.

Martin Herzberg, of Elberfeld, Germany, assignor to Farbenfabriken of Elberfeld Co., of New York, N. Y. Patent No. 792,034, dated June 13, 1905.

The inventor has found that new and valuable azo dyestuffs are obtained by first combining the diazo compounds obtainable from mononitroacetyl paraphenylenediamin having the formula:

with amidonaphthol disulphonic acids in alkaline solution and then splitting off from the resulting dyestuffs the acetyl group by saponification.

The new dyestuffs are, in the shape of their alkaline salts, dark powders soluble in water. They yield upon suitable reduction with stannous chlorid and hydrochloric acid triamidobenzene and diamidonaphthol disulphonic acids. They dye unmordanted wool from acid-baths black shades.

The claim specifies the product so obtained from 1.8 amido naphthol 3.6 disulphonic acid.

AZO DYE ADAPTED TO FORM LAKES.

Paul Julius and Ernst Fussenegger, of Ludwigshafen-on-theRhine, Germany, assignors to Badische Anilin und Soda Fabrik. Patent No. 792,421, dated June 13, 1905.

This invention relates to the manufacture of new azo coloringmatters which are especially suitable for use in the form of their lakes.

The new coloring-matters are prepared by combining with 2-naphthol-3.6-disulpho-acid a diazotized meta-nitro-amido-benzene which contains a methyl group in the para position to the amido group. The bases which we may make use of include nitro-toluidin (NH2: NO2:CH=1:3: 4) and nitro-xylidin, (NH2:NO2:CH ̧:CH, 1:3:4:6).

The product obtained from nitro-xylidine is easily soluble in hot water.

Its barium salt is insoluble and possesses a bluish-tinted red color. Upon reduction with tin and hydrochloric acid it yields 4.6-diamido-meta-xylene and amido-naphthol-disulpho-acid.

REDDISH AZO DYE.

Karl Krekeler, of Elberfeld, and August Blank, of Leverkusen, near Cologne, Germany, assignors to Farbenfabriken of Elberfeld Co., of New York, N. Y. Patent No. 792,600, dated June 20, 1905.

This invention relates to the production of new azo dyestuffs which can be obtained by combining diazo compounds with the 1.2-naphtimidazol-5-oxy-7-sulphonic acid or derivatives thereof substituted in the heterocyclic nucleus having the following general formula:

R and R, meaning hydrogen or an aryl or alkyl. The said naph