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Paper reciepts that turn black ( or blank ) are due to the use of thermal print technology, where the printer exposes the paper to heat to generate the printed letter or number. As this requires the use of thermaly sensitive paper, any subsequent heat from something such as sunlight ( on a reciept left on the dash of a car) will over time turn it black or in the case of being in a wallet, cause the paper to lose its printing( due to constant lower heat causing the chemically treated paper to lose its sensitivity), . It has been suggested that stores use this technology on purpose, in that by the reciept becoming no longer readable...they have less returns.

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14y ago

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