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No you dont have to, but when you do soak it in soda ash before dying the shirt it will completely hold all the color in. When you dont only a small portion of the color stays in the shirt fibers.
You use cold water to do this. First, soak the shirt in white vinegar to set the dye so it doesn't bleed.
Bleach the shirt and then let it soak in hot water.Bleach the shirt and then let it soak in hot water.
Osmosis
cucumbers and brine vinegar soak the cucumbers in the vinegar for about 48 hours
You soak it in vinegar and rosemary leaves
about 7 sec
soak cabbage in vinegar
blood
vinegar
Yes, it it will. Soak your plastics in white wine vinegar for 24 hours.
Soak it in coffee, vinegar, or tea. Let it dry overnight. You might want to burn the edges, too, after it's dry.