| 摘要 |
<p>Compositions for coating a paper or similar base to be used in duplicating (see Group XVI) comprise in stated proportions (1) gas black, "methocel," crystal violet and water; (2) gas black, polyvinyl alcohol, crystal violet, methyl green, basic fuchsin, chrysoidine and water; and (3) zinc sulphide, "methocel" and water.</p> |
