the bottom line on staining a cloth or a towel by wiping one's hands on it; wiping one's hands on the same color towel;
Preparations for a Weekday: Is One Allowed to Wash One's Hands Over Dirty Dishes in the Sink?;
מחמת חסרון כיס Machmas Chesron Kis: It All Depends on the דעת of the Owner. A Utensil Used to Cut Wood;