unsized paper stained blue with litmus, to be used as a test for acids; when reddened by an acid, it serves as a test for alkalis.
| 单词 | θ67272 |
| 释义 | the world > matter > chemistry > chemical tests > indicators > [noun] > test papers (10) litmus paper1803 unsized paper stained blue with litmus, to be used as a test for acids; when reddened by an acid, it serves as a test for alkalis. turmeric paper1806 unsized paper tinged with a solution of turmeric, used as a test for alkalis. test-paper1827 (a) a paper impregnated with a chemical solution which changes colour in contact with certain other chemicals, and thus becomes a test of the… georgina paper1843 a kind of paper coloured violet by dahlia petals, used as a pH indicator (turning red with acids and green or yellow with alkalis). ozone paper1861 a test paper impregnated with iodide ions which darkens in the presence of ozone. ozone test paper1872 = ozone paper n. turmeric test-paper1880 lead-paper1890 a test-paper treated with a preparation of lead. tetra-paper1890 A kind of test-paper. Subcategories:— colouring matter of constituents (1) |
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