After washing, colour can change because the fabric shrinks and becomes denser, because excess dye is removed and because finishing products (softener, size) wash out. The shade often looks slightly lighter or duller. Over the long term, light, detergents, bleach and sweat cause fading, especially on bright and dark shades.
To estimate the change, wash a swatch following the care label and compare it with an unwashed one. Approve the colour after washing too, if the product will be washed often. Ask for wash and light fastness, and give customers instructions: wash at 30°C, inside out, no bleach.
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