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Please advice. 1. I'm thinking of making Facial Spray. Use it on my face. If using mild preservative eco สารกันเสีย in Facial Mist/Spray with about 90% water is suitable or not, how many % do you recommend to put in the formula? Glycerin e Essential Oil 2. When spraying, spray mixed with Mild Preser...

Ask for advice. 1. That this mild preservative eco will be used as สารกันเสีย in water based Facial Mist/Spray approx. 90% or not, how many % do you recommend to put in other things in the formula? Glycerin e Essential Oil 2. And when you spray the spray with Mild Preservative Eco mixed on your face...