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thank you very much

thank you very much

Hello, I would like to ask if I use 1, 3 Propanediol is a solvent. Mild Preserved Eco for serum watery formula If so, what ratio must be used? and the use to mix 1% serum based on the already dissolved mixture Or before mixing the solvent, if not, use Butylene Glycol can I substitute it? What ratio ...

If making a cream base for 35-60 years old, use 6%-10% oil in the formula. Which one should be used? Wax Cream Maker with Natural White Beeswax and how should I use it with other emulsifers?