What are the circumstances needed to consider one's actions "מדידה של מצוה" (measuring for a mitzvah).
Is One Allowed to Salt Vegetables When They Are Sliced or Peeled?;
Removing a Scab from One's Skin, Pulling Out a Non-bleeding Tooth, and Removing Warts, Pimples, etc. with a Utensil;
understanding the two views with "דרך לכלוך" (coloring destructively). (Wiping one's hands on a towel from grape juice, blood, pomegranate, colored ices, etc.);