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MB3 147a: Coloring Food on Shabbos (320:19-20); Salt Water on Shabbos (321:1-2)
The melacha of dyeing doesn't apply to food on Shabbos. Fruit that can cause clothing to become discolored.
Using grass/branches designated for animal fodder vs. firewood.
Making salt water in large quantities on shabbos is prohibited because it is similar to מעבד.
L’ilui nishmas Anna Glatt, Chana bas Meir Avraham, a”h