Stearin

Stearin (or /ˈstɪɹɪn/) is a glyceryl ester of stearic acid, derived from animal fats created as a byproduct of processing beef. It is used as tallow in the manufacture of candles and soap. In the manufacture of soap, it is mixed with a sodium hydroxide solution in water. The following reaction gives glycerin and soap (sodium stearate): C₃H₅(C₁₈H₃₅O₂)₃ + 3NaOH → C₃H₅(OH)₃ + 3C₁₇H₃₅COONa

Stearin is also used in conjunction with Aluminum Flakes to help in the grinding process in making Dark Aluminum powder. It is a side product during extraction of cod liver oil removed during chilling process at temperature below -5°C.