"צביעה באוכלים" (coloring in foods) - the stringent view of some poskim
How to Work with Thick Ointments and Creams on Shabbos;
wiping one's hands or mouth on a towel when they are dirty from colored foods or drinks (e.g., grape juice, pomegranates, colored ices, etc.);
(Temporary Ohel) What are some of the conditions and guidelines to go along with temporary roofing, shelter, etc.