| 摘要 |
An oil based red ink for a ball point pen comprising at least one organic solvent selected from the group consisting of alcohols and glycol ethers, a resin and a colorant, wherein the spectral reflectance determined in the state where the ink for a ball point pen described above is filled into an ink reservoir is 20% or more at least in a longer wavelength area than 620 nm; and a spectral reflectance-rapid increase area which is the area where a difference between a spectral reflectance in the area and an average spectral reflectance in 400 to 560 nm is plus 4% or more is present between 580 to 600 nm. A color of this ink can be identified from the appearance through a barrel of the ball point pen, and the color thereof is close to the drawn line color obtained in writing.
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