4
votes
1answer
53 views

What halachot are affected by color blindness?

What halachot are affected if a person is colorblind? One probable example I can think of relates to the laws of niddah and checking emissions. Another less likely example would be the the halachic ...
7
votes
7answers
285 views

Wearing photo gray glasses on Shabbos

In the question Pregancy Test on Shabbos a notion was raised in an answer that the chemical reaction is a problem due to tzovaya. So what are the boundaries of this, in terms of chemical reactions ...