1892.] NEW YORK ACADEMY OF SCIENCES. 17T 



Black on Tarn. 

 Mordant in bath of 



K,Cr,0, 0.2 gm. 



for 1^ hours at 100° C, drain, and dye in bath of 



Logwood E.xtract, 51° Tw. . . 1.50 gms, 

 for 2^ hours at 100° C, bath should be acid with Acetic Acid ; allow 

 to cool over night in bath, wash, and dry. Results are very good. 



The dyeing with indigo on a small scale not proving successful, 

 is omitted ; the best results, however, may be obtained with the 

 sulphite vat. 



The following recipes from a practical American wool-dyer are 

 added to this article with the hope that they may prove of value to 

 some of the readers : — 



Recipes to Dye Wool Black. 



(100 pounds clean Wool.) 

 No. 1. 

 Prepare with 



Blue Yitriol (CuSOJ . . . 1| pounds. 

 Copperas (FeSO^) .... 3 pounds. 

 Boil wool 1^ hours, then take out of the tub and drain ; throw 

 away this liquor. 

 Color with 



Chip Fustic 10 pounds. 



Chip Logwood . . . 15-35 pounds. 



The quantity of Logwood depends upon how intense a color is 

 wanted. 



Boil chips in a bleeding bag 2 hours before putting in the wool ; 

 boil wool in this liquor H hours, turn off steam, and let the wool 

 remain in the liquor until it cools — 2 hours or longer; then drain 

 off the liquor. 



No. 2. 



Prepare with 



Bichromate of Potash (K^Cr^O,) . 2 pounds. 



Boil wool H hours, then take it out of the tub to drain, and throw 

 away the liquor. 



Color with 



Chip Logwood . . . 15-30 pounds. 



The quantity depends upon how intense a shade is required. 



Boil chips in bleeding bag 2 hours and treat wool as in recipe 

 No. 1. 



Where there is time, permit the wool to remain in the prepara- 

 tion (in either recipe) 2 hours after it is boiled, and let the liquor 

 cool before draining it off; the wool is of softer feeling than if 

 pushed through quickly. 



