Electrochromic printing medium
An electrochromic printing medium containing a substrate impregnated with a leuco compound and a bromide which is capable of electro-oxidatively converting the leuco compound into a dyestuff is characterised in that the leuco compound contains one or more ether or ester groups which can be detached...
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| Format: | Patent |
| Sprache: | eng ; ger |
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| Zusammenfassung: | An electrochromic printing medium containing a substrate impregnated with a leuco compound and a bromide which is capable of electro-oxidatively converting the leuco compound into a dyestuff is characterised in that the leuco compound contains one or more ether or ester groups which can be detached to form the dyestuff on exposure to bromine and an electric field. |
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