4
votes
1answer
63 views

Tanning on Shabbos

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 ...
4
votes
3answers
90 views

Red and white wine Mixed

Is it a problem to mix red wine and white wine on Pesach because of the Problem of coloring on Yom Tov and is there a way to mix with out running into the problem of coloring?
4
votes
1answer
74 views

Pampers tzovehah (dyeing) on shabbas

Pampers make diapers which have a wetness indicator. Initially it is a yellow stripe when dry; when wet it turns blue. I am wondering whether this would be considered tzoveha. ...
6
votes
1answer
121 views

Is it permitted to use a thermochromic cup on Shabbos?

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 ...
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 ...
2
votes
1answer
112 views

Making Fruit Punch on Shabbos

Why is making fruit punch on Shabbos not a problem of coloring?
9
votes
1answer
134 views

Tzoveah on Shabbos

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 ...