27 CFR § 21.23
Formula No. 19
April 24, 2020
To every 100 gallons of ethyl alcohol of not less than 160 proof add:
4.0 gallons of either methyl isobutyl ketone, mixed isomers of nitropropane, or methyl n- butyl ketone; and
1.0 gallon of either kerosene, deodorized kerosene, gasoline, unleaded gasoline, rubber hydrocarbon solvent, or heptane.
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