§ 21.121 - Peppermint oil, Terpeneless.
Specific gravity at 25 °C. 0.890 to 0.910.
Refractive index at 20 °C. 1.455 to 1.465.
Esters as menthyl acetate. 5 percent minimum.
Menthol (free and esters). 5 percent minimum.