There are many variables that can affect the performance of fragrances in cold process soaps. To help out our soap makers, we’ve begun testing our soap-safe fragrances and reporting results on each individual fragrance page. Below, we’ve shared our process for testing the fragrances. Please use our results as a baseline for your own testing, as your results might differ.
We unmolded the soap between 24-72 hours, then cut them. We documented scent strength, changes in odor, and any discoloration. We allowed the bars to cure on a wire rack for four weeks and then checked for scent strength, discoloration, and changes in scent profile.
We only tested fragrances that are allowed by IFRA in Category 9 at 5% or higher. Before running your own tests, be sure to review the IFRA certificate for maximum usage levels on the product page. Using more or less fragrance may produce different results in your final product.
Once the soaps cured, we saved one bar for reference and donated the others to Urban Ministries of Durham.