Shop › Redken Acidic Color Gloss Shampoo 300ml Image 1 of 1 Redken Acidic Color Gloss Shampoo 300ml A$58.00 Sulfate-free shampoo for colour-treated hair that helps preserve vibrant colour and enhance shine. Quantity: Add To Cart Added! Sulfate-free shampoo for colour-treated hair that helps preserve vibrant colour and enhance shine.