Popsugar Beauty Hair What Is Double Process? Literally Everything You Could Ever Want to Know About Double Process Hair Dye 8 March 2018 by Alaina Demopoulos First Published: 6 October 2017 View On One Page Photo 20 of 25 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 20 . . . Of acid wash hair! Eight hours later, my dreams of '80s rocker hair came true. Previous Next Start Slideshow HairBeauty TrendsBeauty How-ToBeauty NewsHair TrendsHair Colour