27 CFR 21.23 - Formula No. 19.
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§ 21.23 Formula No. 19.
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.