A Few Laws of Forbidden Things on Shabbat Connected to Categories of Work, 14 Seifim: 1. It is forbidden to remove hair or nails, whether by hand or using a tool, whether from oneself or others. He who does this is liable for punishment after pulling two hairs. If he is removing white hairs from amongst black ones, he is liable even after only one hair. This practice [of removing white hairs among black hairs] is even forbidden during the week because it is considered crossdressing. Rem"a: And see above at the end of Chapter 303 regarding the laws of combing and parting hair.
2. One is forbidden from removing a wart from his body, whether using his hand or a tool, whether for himself or for someone else.
3. One who erases ink from parchment or wax from ledger is liable for punishment if the space that he erased has room for two letters. Rem"a It is forbidden to cut a cake that has letters on it, even though one just intends to eat it, because it is considered erasing (Mordechai Perek Klal Gadol).
4. One should be careful not to use juice or ashes to write on a table with his finger. However, he is permitted to make gestures of letters with his fingers (Trumat HaDeshen chapter 63).
5. One may mark a book with his fingernail to indicate something, because this type of mark does not last long.
6. If a thread comes loose, it is forbidden to tighten it because this is considered sewing.
7. Those who use a string to fasten their clothes around their arms are forbidden from tightening them unless the holes are wide and are sewn on in a circle.
8. If fabric fell out of a pillow, one is permitted to put it back, but it is forbidden to put it in the pillow for the first time.
9. It is forbidden to gather salt from a salt deposit because this is similar to binding sheaves. Similarly, it is forbidden to gather anything from the place that it grows.
10. Collecting figs to make a chain and piercing a hole in figs then putting a string through them to make them one entity are both subsets of binding sheaves and one who does these things or anything similar is liable.
11. Even though one may put sesame seeds and nuts in honey, he should not press the mixture with his hand.
12. One who puts flax seeds, sesame seeds, or anything similar into water is liable for kneading because they mix in and become attached to one another.
13. We do not break ceramic or tear paper because this is like preparing a vessel for use.
14. Attaching together papers or skins using the glue that scribes use or something similar is a subset of sewing, and one who does this is liable. Similar, someone who separates papers or skins that are attached, if his intentions are not just to destroy, this is a subset of tearing, and he is liable.