"צביעה באוכלים" (coloring in foods) - the stringent view of some poskim
Cutting Dental Floss; Questions Which Come Up with Toilet Paper; Opening Small Packets of Sugar, Ketchup, Salt, etc.
Is one allowed to mix in the liquid, which came out of the original mixture from sitting around.
How Do We Look at Talking in Regard to הכנה (Hachana)?;