understanding the two views with "דרך לכלוך" (coloring destructively). (Wiping one's hands on a towel from grape juice, blood, pomegranate, colored ices, etc.);
How do we determine which fruits or vegetables are allowed to be squeezed for the juices.
Introduction to the Melacha of מבעיר Part 2. (Also Important Information in Reference to Suntanning on Shabbos);