| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a marking pen, which carries a sodium hydroxide as a color developer and has stability with time under the condition that the marking pen carries an erasable ink composition having a pH indicator as a coloring agent. <P>SOLUTION: In the wadding type marking pen, which carries the erasable water-based ink composition including water, a water-soluble organic solvent, the pH indicator, the sodium hydroxide and an organic amine, polypropylene fibers are used as the wadding. In addition, by blending 0.01-5 mass% (to the total sum of the composition) of the fluorescent coloring agent or fluorescent whitening agent, which is visually inrecognizable under visible light or daylight and visually recognizable under the state by being irradiated with ultraviolet light, with the ink composition, a holograph can be visually recognized again after erased once. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
