Section 21.106-T - Distilled lime oil (Citrus aurantifolia)(a)Specific gravity at 25 °C. 0.850 to 0.870.(b)Refractive index at 20 °C. 1.4740 to 1.4780.(c)Optical rotation at 20 °C. +30° to +50°.(d)Aldehyde content (as citral). 0.5 to 3.0 percent.(e)Terpene content (as limonene). 45 percent minimum.