| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a photo-erasable aqueous ink composition which is excellent in safety to the human body and gives written lines erasable in a short time not only when exposed to UV-containing sunlight but when applied with only visible light rays and a marking pen using it.SOLUTION: A photo-erasable aqueous ink composition contains Monascus Yellow and a water-soluble surfactant, and the content of the water-soluble surfactant is 3 mass% or higher, relative to the total amount of the photo-erasable aqueous ink composition.</p> |
