New Dyes.

Posselt's Textile Journal 7, 1910

THE AMERICAN DYEWOOD COMPANY have issued a new shade card covering the dyeing of woolens and worsteds by the use of Logwood Blacks.

This is to our knowledge the first complete shade card ever issued dealing with Logwood Blacks. It discusses concisely and yet with satisfactory fulness, illustrating with dyeings, essential facts and principles connected with the dyeing of all wool materials and goods with Logwood. Dyeings are shown on a variety of goods, woolens and worsteds; ladies' and men's wear. Errors in the use of Logwood on wool are exposed, and the proper methods of obtaining satisfactory standard results are clearly stated. This card fills a long felt want in the trade. We have frequently been in receipt of questions relating to the use of Logwood. Doubtless many manufacturers and colorists will find this card of material assistance in solving some of their problems. A copy can be secured by writing to the American Dyewood Company, New York, or their branch houses.

Two points in particular attract our attention. First, the discussion and illustration of the use of different Mordants in the development of Hematine. Very astonishing differences in depth are shown by dyeing the same percentages of Hematine on different Mordants. It is claimed that the other properties considered in dyeing—penetration, levelness, fastness and the feel of the dyed goods likewise are effected. Secondly, there is a discussion of the proper method of obtaining true Logwood Blacks of standard tone. depth and fastness. Dveings of Hematine Paste from 10% to 40% are shown side by side with Logwood Blacks toned with Fustic and Alizarine Red. This toning with Fustic and Alizarine Red, except slightly or for particular shades, it is stated, should be avoided.

The true Logwood Black is made by using increased amounts of Hematine until the depth of shade desired is obtained. The properly dyed true Logwood Black. it is claimed, is not only low cost. but also of excellent fastness to light, fulling, boiling in water. and to the principal requirements considered in the choice of a fast dyestuff.

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THE CASSELLA COLOR Co. have issued Supplement 2,0 to their Cotton Dyeing-Book, descriptive of Diamine Nitrazol Brown G F Patented, coupled with Nitrazol C. Pat. Diamine Nitrazol Brown CT F Pat. can well hp regarded as a valuable addition to the groom of Diamine Nitrazol colors: when coupled according to the process described in this supplement, its dyeings are distinguished by their bright yellowish brown shades, which possess very good fastness to washing and acids and which are easily discharged a pure white, a feature that will commend this product to the attention of print works.

This dyestuff also lends itself admirably as a shading product and may be used in combination with an other coupling product, particularly for the production of brown and bronze shades.

Owing to its ready solubility, it is regarded with great favor for machine dyeing. Full technical details of the application of this dyestuff are contained in the supplement and are extremely simple.

That the process of coupling is of wide extent is evidenced by the fact that the Cassella Color Company is enabled to bring to the attention of dyers two valuable products designated respectively Diamine Nitrazol Scarlet A, Pat, and Diamine Nitrazol Bordeaux G B, Pat., two products which are distinguished by their bright shades, generally good fastness to washing and easy dischargeability. These dyestuffs may be used for producing reds and clarets and also as shading products in the production of, brighter shades with any other members of the Nitrazol group.

Supplement No. 6o to the volume on Cotton Dyeing is illustrated with four dyeings of each of the two products named, showing various uses to which the colors may be put. The discharge dyeings with Hyraldite will prove of particular interest to print works, on account of the clear brilliant white obtained, a property which is of great value. Copies of either supplement may. no doubt, be obtained upon request to the Cassella Color Company.