How to Make Charcoal Soap: Activated Charcoal Use Rates and Tips
Activated Charcoal Soap Color Guide for Soapmakers. Activated charcoal usage rate: The standard recommendation for activated charcoal is to use 1/8 up to 1tsp of charcoal per pound of oil (PPO). This means that for every pound (454g) of oil in your formula, add anywhere from 1/8 to 1tsp of charcoal to obtain a range of grays to blacks.