is the usage rate stated on the website?- Cocamidopropyl Betaine (Coco Betaine) - Sulfate-Free Foaming Base can be used as สารชะล้าง main, and how much do you need per 1 liter of water?
The web page says 30-35% of the total formula = 300- 350g per 1 liter of waterand how much do you need per 1 liter of water?
สารกันเสีย use 1%. yesสารกันเสีย 10