R' Menashe Klein, Mishneh Halachot: An Older Man Dying His Hair. Sefer Chasidim. A Man Using a Mirror on Any Day. A Man or Woman Using a Mirror on Shabbat. R' Chaim David Halevi: A Single Male Student Dying His Hair. Chumrah of the Week Phenomenon. - Feb 5, 2023 - Miriam Baumel. Mishneh Halachot 16:36: Older single man wants to dye his hair to help getting married. May a man or even a woman look at themselves in a mirror on Shabbat? A man using a mirror on a weekday. Importance and some aspects of Sefer Chasidim. No. 379: Young woman interested in meeting, possibly marrying, a certain older man: May he dye his hair black before meeting her? The Rav in the elevator: "Ladies first." Wearing kipah in bed while sleeping. Rambam: Forbidden for a man to dye even one hair black. Chumrah of the week phenomenon. R' Chaim David Halevi, Aseh Lekha Rav: Responsum 50: A single yeshiva student dying his hair for marriage purpose. If this is similar to a medical need it would be permitted under two conditions.