SIMPLIFIED TEST FOR DETERMINING ALDEHYDE CONTENT
Proprietors of distilled spirits plants and others concerned:
Purpose. This circular is issued to inform you that Revenue Ruling 61-205,
published in Internal Revenue Bulletin No. 1961-48, of November 27, 1961,
provides a simplified test for determining whether distillates contain
one-tenth of one percent or more of aldehydes.
Background. 26 CFR 201.275 provides that distillates containing substan-
tial quantities of fusel oil, aldehydes, and other extraneous substances
may be removed from the distilling system before the production gauge for
addition to fermenting or distilling material at the distillery where pro-
duced. Such distillates must be tested before removal from the system.
If the test indicates an aldehyde content of less than one-tenth of one
percent (and fusel oil content of less than one-half of one percent), an
application to the Assistant Regional Commissioner and his approval is
required before the distillate may be removed from the system and used.
Authorized test for aldehydes. To assist proprietors, the National Office
laboratory has developed the following simplified test for determining
whether distillates contain one-tenth of one percent or more of aldehydes:
Reagent - 0.02 grams potassium permanganate per liter of distilled water (freshly prepared solution).
To 1 milliliter of distillate add 10 milliliters of USP grade 190 proof ethyl alcohol.
Add 5 milliliters of reagent to the diluted sample.
Ifonepercent (.001) or more of aldehydes --in one minute or less.
for use at any distilled spirits plant where containing aldehydes are added to fermenting or distilling under the provisions of 26 CFR 201.275.
Inquiries. Inquiries concerning this circular should refer to its number
and be addressed to your Assistant Regional Commissioner (Alcohol and
Dwight E. Avis
Director, Alcohol and Tobacco Tax Division