Fingerprints; invisible ink; writing on one skin; x-rays.
הכנה ליום אחר (Preparations for a Weekday): Washing Dishes on Shabbos for Sunday. Releasing a Halachic Vow (הַתָּרַת נְדָרִים);
Various types of payments; payment during the week.
Does This Melacha Apply to Cutting Food Down to Size;