It may be hard to believe but there are people who are actively searching for answers on how to help people keep shabbos. "Whatever do you mean" , you ask? How do Jewish religious doctors keep records of patients on Shabbos for example. The answer from Institute for Science and Halacha: an ink that disappeared after 72 hours, enabling photocopying the following day, but not proscribed by the Torah because it is not permanent.
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