What product typically has no pH level?

Nail polishes typically have no pH level because they are non-aqueous products. The pH scale is relevant primarily to aqueous (water-based) solutions, as it measures the concentration of hydrogen ions in a liquid. Nail polishes, on the other hand, are made up of various solvents, resins, plasticizers, and pigments, which do not dissolve in water. As a result, they do not have a measurable pH like conditioners, shampoos, and hair colors do, which are formulated with water and can have acidic or alkaline properties influencing their performance and the condition of hair and scalp.