27 C.F.R. § 21.26
Formula No. 12-A
Formula. To every 100 gallons of alcohol of not less than 185 proof add:
Five gallons of toluene or 5 gallons of heptane.
Formula. To every 100 gallons of alcohol of not less than 185 proof add:
Five gallons of toluene or 5 gallons of heptane.