pH A measure of the acidity or basicity of a solution. A product with a pH of less than 7 is considered acidic, while a product with a pH of greater than 7 is basic or alkaline. Products with a pH of 7 are considered neutral. In picture framing, a pH other than 7 can diminish the longevity of the artwork. Framing products such as the mat, paper and backing are coated so as to be pH neutral. |