Is it permissible to suntan on Shabbos? The possible prohibition would be tzoveah -- dyeing. Is it considered permanent enough to be Biblically prohibited? Is it dyeing at all being that no coloring ...
A novelty cup, see for example here, appears black when cold. When hot liquid is poured into it, the black changes to white and the previously concealed writing (underneath, so to speak) becomes ...
Why is making fruit punch on Shabbos not a problem of coloring?
It is going to sound strange but here is the question In the toilet there are these blue things that clean your bathroom with every flush by adding bleach hence it colors the water blue every time you ...