Coloring Archives - AskTheRav

Can I make instant oatmeal on Shabbos?

There are two Halachic issues with making instant oatmeal on Shabbos: 1. Bishul: Since the oatmeal was never cooked before, even if it was already baked, one is still not…

Can I use on Shabbos a black mug that when you put hot water in it, the mug changes from black to whatever picture you have on it?

It is forbidden to use on Shabbos. Sources: עיין סימן שמ מש"ז ס"ק ג בנוגע אותיות שפולטים ע"י האש שאסור מדרבנן, ואע"פ שאינו דומה ממש, דהתם מתכוון -…

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…

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…