Coloring Archives - AskTheRav

On Shabbos can we use the diapers that have a special line outside the diaper that changes color from blue to yellow when the child relieves itself?

Yes. Sources: יל״ע מצד הגדול, אם הלבשת התינוק היא בגדר גרמא ע״ד סוף חמה לבא, או שהוא בגדר כח כחו, וגם שהההפרשה עדיין אינה בעולם (אף שנמצאת במעי התינוק).…

Is it permissible to make tea and coffee in a Keli Shlishi using instant coffee or tea bags, or is this considered coloring the water?

Almost all Poskim maintain that there is no issue with coloring food whether solid or liquid. There are those who are stringent L’chatchilla, but their position hasn’t been accepted as…