The H2S is evolved. Fibre becomes reddish brown
on boiling with bleaching powder 5° Tw.: An
Oxidation Black. Aged Aniline Black, Prussiate
Black, One Bath Aniline Black, Steam Aniline
Black, Diphenyl Black, Amido Fast Black.

NOTE.-Chrome Black (By) becomes light brown on reduction with Hydrosulphite X and persulphates change the color to dark brown but not to black.

This paper which is taken from the Journal of the Society of Dyers and Colorists is the application of the author's scheme of analysis to vegetable fibres, that for animal fibres being published in Year Book, vol. viii. It has again been necessary to change the form of the tables but the matter follows the original exactly.

PART III

Patents for the Year 1907

I. DYESTUFFS AND COLORING-MATTERS
II. PROCESSES OF APPLICATION

III. CHEMICAL PROCESSES

IV. MACHINES

Patents for the Year 1907

I.-DYESTUFFS AND COLORING-MATTERS.

YELLOW-RED DYE AND PROCESS OF
MAKING SAME.

Gadient Engi, of Basel, Switzerland, assignor to the firm of Society of Chemical Industry in Basle. Patent No. 841,003, dated January 8, 1907.

In U. S. Patent No. 831,844 is described the manufacture of a bluish-red dyestuff, dyeing in the vat like indigo, by heating salicylthioacetic acid,

in presence of aromatic nitro-hydrocarbons such as, for example, nitrobenzene-at high temperatures. The dyestuff thus obtained dyes cotton without a mordant in an alkaline hydrosulphite vat bluish-red clear tints.

It is now found that dyestuffs of the same character, but a dyeing yellower-red tints, may be obtained by heating salicylthioacetic acid with a nitro-hydrocarbon and an isatin compound-as, for example, isatin, its homologues, and its substitution products. When the mass produced by the reaction is cooled, the new dyestuffs crystallize in the form of brilliant yellowish-red to brownish-red well-formed needles.

AZO DYE AND PROCESS OF MAKING SAME.

Melchior Böniger, of Basel, Switzerland, assignor to corporation of Chemical Works formerly Sandoz. Patent No. 841,371, dated January 15, 1907.

This invention relates to the manufacture of new monoazo dyes suitable for subsequent chroming or treatment with bluestone by the action of orthodiazophenol compounds on aryl 1.8 naphthylamine sulphonic acids. The direct dyeings of these dyestuffs on wool in an acid-bath vary from blue-red to dark violet and are transformed by subsequent treatment with bichromate or blue-stone into very valuable dark blue, blue-black, and deepblack shades of excellent fastness to light and milling. The best results have been obtained by employing for the combination with aryl 1.8 naphthylamine sulphonic acids the diazo compounds of monoand dichloro-ortho-amidophenol, mono- and dinitro-orthoamidophenols, chloro-nitro-ortho-amidophenols, nitro-ortho-amidocresols, ortho-amidophenol sulphonic acids, their homologues and substitution products.

BLUE SULPHUR DYE AND PROCESS OF
MAKING SAME.

August Leopold Laska and Georg List, of Offenbach-on-the-Main, Germany, assignors to Chemische Fabrik Griesheim Elecktron. Patent No. 841,877, dated January 22, 1907.

The inventors claim that by heating monoalkylpara 1-amidometa 1 chlor-para-oxydiphenylamines with alkaline polysulphides under certain conditions blue dyestuffs of great technical value and very bright shade are obtained. These dyestuffs are very fast to washing and contain no chlorine. The diphenylamine derivatives may be obtained by the joint oxidation of para amidophenol and orthochlormonoalkylaniline in equimolecular proportions and reduction of this oxidation product.