| abstract |
(57) [Summary] [Structure] A water-based pigment for writing instruments used for writing instruments such as ball-point pens and marking pens, etc., in which the ink containing chamber is formed of a transparent or semi-transparent material so that the used ink can be seen from the outside. In the ink, the coloring material of the aqueous pigment ink for a writing instrument comprises a yellow pigment such as benzidine yellow G and a blue pigment such as phthalocyan blue, and the weight ratio of the yellow pigment and the blue pigment is 3: 7 to 7: 3. Is. [Effect] The ink in the writing instrument appears to be the same color as the handwriting, so the display effect is excellent at stores. |