Ball for pen pen and ball point pen

摘要

In the case of a ball pen ink containing at least one kind of organic solvent, resin and coloring agent selected from the group consisting of alcohols and glycol ethers, the spectral reflection in the ink receiving tube filled with the ballpoint pen ink The ballpoint pen for a pen having a spectral reflectance sharpness range between 580 and 600 nm with a rate of at least 620 nm greater than or equal to plus 20% and a difference between the average spectral reflectivity of 400 to 560 nm and over 4%. This ink can be used to determine the color of the ink in appearance through the main shaft of the ballpoint pen, and is approximated to the drawing green obtained by the writing.