| 摘要 |
<p>A very thin film of acidic color developing material which reacts with a dye precursor to form a color upon contact therewith is obtained in a substantially spongy capillary-like film firmly adhered to the paper substrate without diffusing thereinto in accordance with the present invention, The film contains a phenolic resin, and amorphous lipohilic silica, preferably pyrogenic hydrophobic silica, and a fatty alcohol, preferably cetyl alcohol. The composition further preferably includes a non-volatile solvent, This composition not only provides excellent color-forming ability with a very thin film which adheres firmly to the paper, but may be applied to the paper with a standard printing press.</p> |
