One of the mysteries of the English language finally explained.
A paper impregnated with an indicator that changes color under known conditions, used especially to test for acidity.
- ‘Mortality with 4 per cent DDT impregnated test papers was 17.5 per cent.’
- ‘In the presence of acid phosphatase, the test paper develops violet stains on the white test paper.’
- ‘Place the moist test material on the test paper, which after a few seconds will show a clear, violet coloration in the presence of acid phosphase.’
- ‘In acid solution, oxidizing agents react with the iodide in the test paper to liberate iodine.’
- ‘When using the test paper, first add a few drops of hydrochloric acid to the solution to be tested.’
test paper/test ˈpāpər/
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