Message: Why do you use 100% cotton when dying? What is the purpose of dipping the shirt in vinegar at the end of the process?
One can use any sort of fiber in dyeing, if the correct dye is chosen. Different fibers require different types of dye. See my page, “About the Dyes: choosing the right dye for your fiber“.
There is no need to dip a shirt in vinegar at the end of the dyeing process, unless the shirt is made of silk and will benefit from correcting its pH. Contrary to the popular myth, vinegar does not set dyes in cotton.
(Please help support this web site. Thank you.)