how can i colour fast fabrics?

Question

i am using rit dye and need to know how do i colour fast the finished product to prevent the colour from bleeding out? I need proportionate measurements I am dying a t shirt made of cotton. thank you

Answer 1

You can soak the finished garment in a combination of one-fourth white vinegar with three-fourths cold water.
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Answer 2

Check in your laundry supplies at the grocery store. There is a product there that will do it but I can't remember the name { it was sent to me as a sample}