Coffee with a hint of chocolate. The perfect combination for a frappucino soap!
Fragrances can be made up of hundreds different components and it isn’t just vanillin that causes discolouration. Any of the essential oils, resins, natural and synthetic aroma chemicals can have an effect on the final colour of the soap.
I’m a big fan of soap pigments. They tend to colour my soap very evenly and are easy to use. They are definitely a lot less messy than lakes and micas, and also a little goes a long way. I would strongly suggest to invest in a trio of soap pigments, if you are into cold process soap making!