| 摘要 |
<p>PURPOSE:To provide a double color developing ink compsn. which develops a beautiful golden color at the central part of handwriting and a beautiful color on the periphery thereof and in which handwriting is not discolored even when preserved over a long period of time, consisting of brass powder pigment, a specified oil-soluble dye, a specified oil-soluble resin and a non-polar org. solvent. CONSTITUTION:The titled compsn. which develops a golden color at the central part of handwriting, consists of brass powder pigment (A), at least one oil-soluble dye (B) selected from C.I. solvent Red 49 and solvent Black 7 and 50, an oil- soluble resin (C) having an acid value of 10 or below, e.g. cumarone or phenolic resin, and a non-polar org. solvent (D), e.g. xylene. When dyes other than the dye B are used, the color on the periphery of handwriting becomes dull and a beautiful double color developing effect can not be obtd. When the acid value exceeds 10, the color at the central part of handwriting becomes dull.</p> |
