| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sheet which, unlike a scratch sheet, can be used without forming ink chippings and is provided with a hidden image which is variously colorable by rubbing, to provide a hidden ink composition usable therein, and to provide a hidden ink writing utensil capable of giving a joy of making a monochromatic or polychromatic hidden image coating film. <P>SOLUTION: What is provided is a hidden image ink composition containing, based on the entire amount of the ink composition, (i) 0.1-20 wt.% leuco dye, (ii) 0.1-60 wt.% color developer, (iii) 0.1-60 wt.% sensitizer, (iv) 0.05-40 wt.% binder component, and (v) 0.1-50 wt.% extender pigment, a hidden image sheet provided with a coating film of the ink composition, and a writing utensil filled with the ink composition. <P>COPYRIGHT: (C)2008,JPO&INPIT |
