Purpose of Testing for Toner:
The primary purpose of testing a toner is to evaluate its safety, efficacy, and quality for cosmetic use. This includes verifying:

• pH Level – to ensure skin compatibility and maintain the skin’s natural acid mantle

• Microbial Safety – to check for harmful bacteria, yeast, or mold contamination

• Stability – to assess shelf life and product integrity under various conditions

• Dermal Safety – through patch tests to ensure it does not cause irritation or allergic reactions

• Efficacy Claims – such as pore tightening, hydration, or oil control, based on clinical or instrumental studies