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Pink (To a solution of chloride)
To a solution of chloride or nitrate of cobalt in water, add sufficient sesquicarbonate of ammonia to dissolve the precipitate at first formed. Filter as in No. 2313. Or: Wash 1 ounce madder in cold water; digest it, with agitation, for 24 hours in 3 pints water containing 4 ounces sesquicarbonate of ammonia; then dilute with water to the desired shade, and filter as above.