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Polyester Tape Wont Take Dye

Dear Jennifer
I have some un-dyed finished zippers with 100% polyester tape 7 I want to dye them… The problem that the brass teeth / slider / top and bottom stops are attached… I am afraid if these zippers are dyed, it will affect the brass materials: teeth/slider/stoppers…. Can you please help…?
Best Regards
Mourad

sorry, although the brass parts will be fine, the polyester tape will not dye at all.
Jennifer