374 GRUENBERG AND GIES: NOTES ON ‘“‘ BASTARD ’”’ LOGWOOD 
TABLE Vv. 
Sample of Logwood. | Water Added. 7 Sample of f Logwood. | Water Added. 
| io 2 
A $5 C.c | c 7.5 C6 
B 3-5 D* 10.0 
F | 5:5 H | 10.9 
E | 7.1 | 8s | 12.2 
G 7.1 qT | 17.8 
The letters correspond to those in TABLE IV. 
The tinctorial sequence after the above dilution is different 
from what it was before dilution as may be seen from the following 
etynsiet 4 
TasBLe VI 
Bir pig ibe ts) | er | 8 | oe 
Before dilution (TABLE IV). 4) 8) £-)¥ |p.) G |B lets 
After dilution (TABLE V). meet let 64 Crp yw ae 
The above facts are in further harmony with the foregoing 
conclusions regarding cause of coloration effects and_ relative 
differences. 
Dilute aqueous extracts of two samples of red logwood and 
of one medium grade “ bastard’ wood all showed a similar yel- 
low color, by transmitted light. The shades of color did not 
differ noticeably except in degree. In stronger extracts of equal 
concentration the first two appeared more reddish. 
Treatment with alkalies, volatile and non-volatile, turned the 
color of the red logwood extracts to a blood-red, passing into 
purple, whereas in the “‘ bastard” extract the shade of yellow was 
merely deepened, passing into the dull brown color of faded oak 
leaves. Dilute and concentrated mineral acids turned the yellow 
of the dilute aqueous extracts of the red wood into a color rang- 
ing from orange to bright red. In the “bastard” extract no such 
change was perceptible. 
These differences in the behavior of the two sets of aqueous 
extracts toward acids and alkalies correspond to the differences be- 
tween the reactions exhibited toward the same reagents by @ 
* This color was of the same intensity as the rest, but not the same shade. See 
SOene, Bins ey eK 
milar change in sequence of tinctorial intensity after dilution was noted in 
other cia also. 
