1132 Wisconsin Academy of Sciences, Arts , and Letters. 
Table 132 —Ash content of commercial oleoresins. 
Sample 
No. 
Date 
Observer 
Source 
Per cent, of 
ash 
Foreign 
constituents 
1. 
1.916 
DuMez. 
Squibb & Sons... 
Sharp & Dohme.. 
0.12 (a) 
0.29 
Copper 
2. 
1 Contained ether. 
Acid number: The acid number of the oleoresin when pre¬ 
pared with alcohol, acetone or ether was found to be about 19. 
In the case of the two commercial samples examined, however, 
the values obtained differed to a considerable extent, being 19.2 
in one instance and 27.5 in the other. As the preparation 
represented by the first number contained considerable unevap¬ 
orated solvent, this difference can be accounted for in part. The 
high values obtained for the commercial samples are thought to 
be due to their relatively low piperine content or to a partial 
decomposition of the resin. The values obtained for this con¬ 
stant in the laboratory follow. 
Table 133 —Acid numbers of oleoresins prepared in the laboratory. 
Sample 
No. 
Date 
■ 
Observer 
Solvent 
Acid 
number 
1 
1916 
DuMez. 
Alcohol. 
19.2 
2 
Acetone... 
19.0 
3 
44 
Ether. 
18.9 
4 
“ 
Petrol.-ether. 
15.1 
Table 134 —Acid numbers of commercial oleoresins. 
Sample 
No. 
Date 
Observer 
Source 
Acid 
number 
1 
1.916 
DuMez. 
Squibb & Sons . 
19.2 (a) 
2 
Sharp & Dohme. 
27.5 
(a) Contained ether. 
Saponification value: As will be observed in an inspection 
of the first of the tables which follow, the saponification value 
of the oleoresin varies with the solvent employed in its prepara¬ 
tion. This appears to be due principally to the effect which 
the nature of the solvent has upon the pipeline content of the 
