Vacuum packaged color developing composition
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United States of America Patent
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-
Jun 8, 1993
Grant Date -
N/A
app pub date -
May 8, 1991
filing date -
May 10, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
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.
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