See Stains, Table of. U’s. Solution, to distinguish hydrochloric from lactic acid in suspected gastric contents: Add a few drops of neutral ferric-chlorid solution to a 4 per cent, solution of carbolic acid. This is turned yellow by lactic acid, but is not affected by hydrochloric acid when diluted to the strength of gastric juice, 0.2 per cent. See Tests Table of.
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