Chemistry 101: What is pH and why does it matter in skincare

“Chemistry… if you’re not part of the solution, you’re part of the precipitate.”

My 7th grade chemistry teacher was the first to introduce me to the pH scale by using litmus paper. We could establish the pH value of any liquid by dipping the paper into the liquids and then watching to see what color the paper turned. For example, it would show red for vinegar…