Acid wash and stone wash are mechanical and chemical treatments that create a faded, mottled, high-contrast look typical of vintage tees and sweatshirts. They are done on garments with pumice stones, chlorine or permanganate, or on fabric with abrasive washing and enzymes. The effect weakens the fibre, lowers strength and raises shrinkage, and uses a lot of water and chemicals. Variation between pieces is normal. Ask for a suitable fabric (heavy cotton, dark dyed) and an approved effect standard before production.
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