Hello, I would like to ask, how to use Xanthan Gum In the current gel making ingredients use Xanthan Gum 2% and use sodium benzoate 0.05% and Potassium Sorbate 0.05% to สารกันเสีย After mixing it for 1 month, bacteria or fungi (black) appear on the gel surface. Ask >> the body Xanthan Gum should be ...
