A substance used to assist in the classification of another substance

The theory and use of indicators : an account of the chemical equilibria of acids, alkalies and indicators in aqueous solution, with applications / by E.B.R. Prideaux.

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Indicators and test-papers

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The theory and use of indicators : an account of the chemical equilibria of acids, alkalies and indicators in aqueous solution, with applications / by E.B.R. Prideaux.