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This sounds a lot like those Transitions (R) lenses that turn dark in the presence of UV rays. Ovadiya yosef says that making this transitions happen on Shabbos is permissible; it is not dyeing. The fact that there is hidden writing behind the part that changes color is irrelevant. See below for the source for the transitions. ...


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According to Dinonline : "It is permitted to use such a cup (or other utensil) on Shabbos, since no intrinsic change occurs in the object. Furthermore, no dye or coloring is applied to the utensil, and the change in color is simply a temporary chemical reaction to external temperatures."


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I learned that it also used less ink than the traditional "square" script. In medieval times, when making ink was a long, expensive process using oak galls and other uncommon ingredients, it's easy to understand why a printer preferred using a font that used less ink.


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From personal experience, here's what the Sofer thinks about, while writing: It's Lishma - and watch out for names of Hashem that need individual attention to become Lishma. Don't smudge, it's wet ink all around! Is there enough ink to finish the word? Don't drip when refilling the quill. Double check that you didn't overfill and risk a flood. Don't miss ...


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I'm not sure how to answer this question for anyone but myself. The barest minimum requirement for writing a sefer torah is that it be legible. The ink must be black, and the traditional fonts pretty much require all the letters to be very bold. In that sense the sofer does not have to worry about usability because halacha and minhag do the worrying for ...



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