invisible ink (called also sympathetic ink): see quot. 1823.
| 单词 | θ194897 |
| 释义 | society > communication > writing > writing materials > ink > [noun] > invisible ink (4) invisible ink1684 invisible ink (called also sympathetic ink): see quot. 1823. sympathetic ink1721 a name for various colourless liquid compositions used as ink, the writing with which remains invisible until the colour is developed by the… secret ink1852 Kept from knowledge or observation; hidden, concealed. Of a door, chamber drawer, passage, or mechanical contrivance: Designed to escape… Subcategories:— material which shows up (1) |
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