A simple explanation of the difference between toner and astringent, and which one you should be using for your skin type
Testing the pH value of Neutrogena's Pore Refining Toner.
Testing the pH of apple cider vinegar
The pH of fresh lemon juice, used in many DIY recipes, examined.
Determination of Simple's Micellar Cleansing Water's pH rating.
Why you shouldn't use baking soda on your face.
Testing and explaining the pH behind Pixi's Glow Tonic