A technical dictionary of printmaking, André Béguin.
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pH
A measure of the acidity of a solution. pH 7 is neutral, lower numbers are more acidic, higher numbers are more basic. A value on the pH scale of acidity and alkalinity of a liquid or solution; 7.0 is neutral, 0 to 6.9 is acid, 7.1 to 14.0 is alkaline. The pH-value of a solution is pH =-log(H+). See hydrogen ion concentration
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