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- There's no prohibition of dyeing foods on Shabbat even if one intended on dyeing the food. 
- However, dyeing liquor or honey in order that it is more marketable is forbidden because of dyeing besides for performing a weekday activity on Shabbat (Uvda DeChol). Additionally, put dyes in water and leaving it in the sun in order to make dye is a Biblical prohibition.
- Since there's no prohibition of dyeing foods, it is permitted to pour red wine into white wine on Shabbat.  However, a case where one’s intent is to improve the aesthetic appearance of the food, such as adding red wine to white wine for the Pesach Seder, may be an issue of tzoveya. Additionally, this could potentially be considered lasting because one wants the wine to stay colored until one drinks it, thereby serving a purpose for as long as it is colored.
- Some permit adding coloring to a liquid if the liquid only becomes weakly colored (not concentrated) and wouldn't be fit to dye something else. 
- It is permitted to use a toilet that has a colored soap that colors the incoming water when flushed. 
- Many poskim allow wearing glasses that will darken when you go out into the sun and don't think it's a problem of coloring the lenses. 
Paper Towels and Napkins
- Meleches Tzoveiya: Dyeing, Drawing, and Shabbos Cosmetics by Rabbi Daniel Stein
- Crocs and Glasses that Change Color in the Sun by Rabbi Aryeh Lebowitz
- Rambam (Shabbat 9:13-4)
- Shulchan Aruch 320:19, Yabia Omer 2:20, Hacham Ovadia's opinions is also found in Chazon Ovadia, Hilchot Shabbat, Chelek 2, Page 84, which says that tzevia does not apply to foods and drinks.
The Shibolei HaLeket (Siman 86) quotes the Yereyim as stating that there is no violation of dyeing when adding saffron to food, even though it gives it a color, because it is dissimilar to the way dyeing is normally done. Rabbi Ribiat (39 Melachos p. 750) gives two explanations of this idea. Rav Hershel Schachter (Shabbos Shiur #16 min 55-60) suggests another reason: coloring food before you eat it could be considered part of the process of eating, derech achila. See the Shaar HaTziyun (318:65) who notes some achronim who disagree and the Yabia Omer O.C. 2:20 who defends the idea that there’s no tzoveya by food.
- Mishna Brurah 320:56
- Mishna Brurah 320:56, Chaye Adam (Shabbat 24:3)
- Mishna Brurah 320:56
- Mishna Brurah 320:56; Chazon Ovadia, Hilchot Shabbat, Chelek 2, Page 84 includes that tzevia does not apply to beverages
- Nishmat Adam 24:3, Rabbi Ribiat (p. 753).
- Suggestion based on Nishmat Adam 24:3
- Or Letzion (v. 1, Siman 29), Kesot HaShulchan (Badei HaShulchan 146:14)
- Or Letzion (v. 1, Siman 29) permitted to use a toilet that has a colored soap that colors the incoming water when flushed for 4 reasons. (1) The waters don't become a dye, but rather are weakly colored. (2) The dyes aren't permanent and are usually flushed away. (3) One doesn't intend to dye the water. (4) It is a Pesik Reisha DeLo Nicha Leh on a Derabbanan and its Koach Sheni.
- Igrot Moshe 3:45, Shemirat Shabbat Kehilchita (ch. 18 fnt. 70), Yalkut Yosef (Shabbat v. 3, p. 377), Sh"t Bitzel Hachochma 4:4, Rabbi Eli Mansour.
- Shemirat Shabbat Kehilchita 18 footnote 70 writes that wearing the glasses doesn’t constitute tzoveya because the coloring is only temporary and isn’t considered as though a person is doing any action by simply wearing them in the sun.
- Orchot Shabbos 15:96 questions this second reasoning based on the Gemara Sanhedrin 77a, not considering this to be grama. Rather he permits it because dyeing means adding an external dye to a material to give a color; in this case, with photosensitive glasses, the glass itself changes colors and no external substance is being added.
- see Rabbi Ayreh Lebowitz for more on this
- Shulchan Aruch O.C. 320:20, Mishna Brurah 320:59
- Mishna Brurah 320:59