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To choose and apply them

The most important part of dyeing is, therefore, the choice and application of mordants; as upon them, the permanency of almost every dye depends. Mordants must be previously dissolved in some liquid, which has a weaker union with the mordants than the cloth has; and the cloth must then be steeped in this solution, so as to saturate, itself with the mordant. The most important, and most generally used mordant is alumine. It is used either in a state of common alum, in which it is combined with sulphuric acid, or in that state called acetite of alumine.