Color changing correction fluid
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United States of America Patent
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Oct 28, 2008
Grant Date -
Apr 7, 2005
app pub date -
Feb 11, 2004
filing date -
Oct 2, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved color changing correction fluid is provided which includes either a volatile base or a volatile acid in combination with a color changing pH indicator, all in a water based fluid or system. As the fluid dries, the volatile base or acid evaporates along with the water and the pH color changing indicator changes from a colored state to a clear state. For white paper, a white pigment is utilized and therefore the fluid changes from a colored state to a white finished state as the solvent water and acid or base evaporates. Different color pigments can be utilized to match the color of the particular paper or substrate.
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