Origin of test paper
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It is distinguished from meconia by its aqueous solution showing an alkaline reaction with test-paper.
When pure, both the salt and its solutions are neutral to test-paper, and are wholly volatilised by heat.
The resulting solution and jelly are also odourless, neutral to test-paper, free from unpleasant taste, and perfectly transparent.
The fluid is usually tasteless and without smell, and in reaction it is neutral to test-paper.
It is neutral to test-paper, does not affect lime water, and is only slightly absorbed by pure water.Cooley's Practical Receipts, Volume II