COLOR-CHANGE AND ERASABLE WRITING COMPOSITIONS, WRITING INSTRUMENTS, AND SYSTEMS
The present invention provides writing compositions that are capable of being erased or changed in color chemically. The present invention also provides erasing media for erasing or changing the color of marks produced with the writing compositions, as well as writing systems and incorporating the e...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | The present invention provides writing compositions that are capable of being erased or changed in color chemically. The present invention also provides erasing media for erasing or changing the color of marks produced with the writing compositions, as well as writing systems and incorporating the erasing media and the writing compositions. The present invention further provides writing instruments produced using the writing compositions. |
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