Cosmetics Formulation Development

Ingredients - Water - Sulfate Free Shampoo Base (ph.7) - กลีเซอรีน - Mild Preserved Eco™ -sodium chloride 1.If you want to adjust the ph value but don't have a meter, how many % of critic acid should be added to get ph5.5 2. Between Sulfate Free Shampoo Base and Sulfate Free No-Tear Shampoo Base, what's the difference?

Hello, 1. I can't do it. 2. Sulfate Free No-Tear Shampoo Base gets into the eyes and will not irritate the eyes. Similar to no-tear baby shampoo products, but the cleaning efficiency is less. In the case of general adult use, no-tear should be used because the cleaning ability is insufficient.