| 摘要 |
<p>A vacuum package of a color developing composition comprising an aromatic primary amine color developing agent and other components is obtained by vacuum packaging the components in a bag as a layered structure of at least three solid state layers each consisting of a distinct component. A bottom layer consists of the color developing agent. A layer containing a component selected from an organic acid, brightener, polymer, surface active agent, and neutral salt is disposed adjacent the color developing agent layer. Additional layers containing a preservative and an alkaline agent are stacked on the bottom layer through the adjacent layer. The packaged composition is taken out of the bag and diluted with water to prepare a color developer.</p> |
