Color changing correction fluid
AssigneeSanford, L.P.
InventorsWing Sum Vincent Kwan, Jiandong Zhu
Life of this patent
Estimating the term…
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.
Claims29
A color changing correction fluid comprising:
- water;
- titanium dioxide in an amount from about 35 weight percent to about 60 weight percent;
- a volatile base;
- and
- a color changing pH indicator.
A color changing correction fluid comprising:
- water;
- titanium dioxide in an amount from about 35 weight percent to about 60 weight percent;
- a volatile acid;
- and
- a color changing pH indicator.
A method for correcting an error on a substrate, the method comprising:
- covering the error with a coating of a color changing correction fluid comprising water, titanium dioxide in an amount from about 35 weight percent to about 60 weight percent, a volatile base, and a color changing pH indicator;
- and,
- allowing the volatile base and water to evaporate thereby causing the color changing pH indicator of the fluid to change color as the fluid dries.
A method for correcting an error on a substrate, the method comprising:
- covering the error with a coating of a color changing collection fluid comprising water, titanium dioxide in an amount from about 35 weight percent to about 60 weight percent, a volatile acid, and a color changing pH indicator;
- and,
- allowing the volatile acid and water to evaporate thereby causing the color changing pH indicator of the fluid to change color as the fluid dries.
A color changing fluid comprising:
- water;
- titanium dioxide in an amount from about 35 weight percent to about 60 weight percent;
- a volatile base or a volatile acid;
- and
- a color changing pH indicator.
Dependencies are inferred from the claim text.