| 摘要 |
<p>A free-flowing powder of pigment particles having basereacting, chromogenic, colorless, dye-precursor material adsorbed thereon, and a novel pressure-sensitive record sheet material, utilizing said adsorptively-coated pigment material together with a source of colorless liquid ink which produces a color when and where applied to the dye-precursor-coated pigment particles.</p> |
