| 摘要 |
<p>The paper sheet is coated with a compsn. made by grinding a normally colourless or slightly-coloured chromogenic substance, a phenolic substance and a di-ether of formula (I) (in which R is 1-5C alkyl, benzyl or phenethyl), opt. with a surfactant, agglutinant and/or dispersant, with water or organic solvent, in a ball- or sand-mill. - After coating with the dispersion, the paper is calendered.</p> |
