CFR › Title 27 › Part 21 › §21.12927 CFR §21.129Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Carvone content. Not less than 85 percent by weight.(b)Refractive index at 20 °C. 1.4930 to 1.4980.(c)Specific gravity at 25 °/25 °C. 0.949 to 0.956.(d)Odor. Characteristic odor.