10 
BULLETIN 990, U. S. DEPABTaIEXT OF AGBICLLTUBE. 
Dyeing: 
Tests were made on the eight grades by dyeing the yarns with vat 
colors — pink and blue. 
Pink. — The bleached yarn was dyed with the following formula : 
2 per cent penetrol, 2J per cent caustic soda. 2f per cent hydrosul- 
phite, and 4 per cent indanthrene Red B. X. It was dyed at 120° F., 
and run for 45 minutes, then washed in hot water and dried. The 
best pinks were obtained on the grades giving the best bleach. The 
best pink was obtained on Good Middling Yellow Tinged, followed 
in order by Low Middling, Good Middling Yellow Stained, Middling 
Yellow Stained. Middling Yellow Tinged. Low Middling Yellow 
Tinged. Good Middling Blue Stained, and Middling Blue Stained. 
Blue. — The bleached yarn was dyed with the following formula : 2 
per cent penetrol, 8£ per cent caustic soda, 8^ per cent hydrosulphite 
and 12 per cent indanthrene G. C. D. blue. The yarn was dyed at 120° 
F. for 45 minutes, then washed for 10 minutes in hot water (160° F.), 
then in cold water and dried. Good blues were obtained on all the 
grades, there being very little difference in depth of color. 
Breaking strength of bleached and dyed yarns: 
Single-strand strength tests were made of the gray, bleached, and 
dyed yarns to determine the effect of the bleaching and dyeing proc- 
esses. The results of these tests are shown in Table 8. In order 
to put the results on a commercial basis, different skeins were used 
on the gray, bleached, and dyed tests. 
Table 8. — Breaking strength in ounces of single strands fmm gray, bleached, 
and dyed yarn spun from the different grades of cotton, (Mill test.) 
Yam. 
L.M. 
G.M. 
Y.T. 
M.Y.T. 
L.M. 
Y.T. 
G.M. 
Y.S. 
M.Y.S. 
G.M. 
B.S. 
M.B.S. 
Aver- 
4.25 J22: 
Gray 
Bleached. . 
Pink 
Blue 
4.50 J22: 
Gray 
Bleached . 
Pink 
Blue 
4.75 v/22: 
Gray 
Bleached. 
Pink 
Blue 
Double boil chlorine. 
Double peroxide. 
Ounces. 
Ounces. 
Ounces. 
10.4 
11.0 
11.2 
10.4 
11.5 
12.1 
10.4 
11.1 
11.1 
10.4 
11.9 
11.1 
Ounces. Ounces. 
11.1 11.8 
10.7 13.0 
11.0 12.4 
10.8 11.3 
Ounces. 
Ounces. 
Ounces. 
11.0 
10.0 
10.2 
12.6 
11.0 
11.4 
11.7 
11.1 
10.9 
12.0 
10.0 
9.8 
Ounces. 
10.84 
11.59 
11.21 
10.91 
Single peroxide. 
10.4 
9.7 
10.0 
10.2 
11.1 
12.4 
12.9 
11.6 
11.9 
11.0 
11.1 
11.8 
10.7 
13.3 
11.5 
11.2 
11.1 
12.0 
11.7 
11.4 
10.4 
12.4 
12.4 I 
11.8 I 
10.5 
10.9 
10.0 
9.7 
10.8 
10.9 
9.9 
11.0 
10.91 
11.25 
11.35 
11.20 
Single chlorine. 
10.6 
11.4 
11.2 
10.7 
11.8 
10.5 
11.6 
11.8 
12.6 
11.9 
11.4 
11.4 
10.7 
11.4 
10.9 
10.6 
11.9 
10.5 
10.9 
11.7 
11.4 
10.3 
10.1 
10.8 i 
10.0 
10.5 
10.7 10.85 
11. 11. 46 
10. 5 10. 88 
10. 2 10. 62 
