Why does dark laundry come out with white?

Answer 1

The dye in dark clothing comes out regardless of the presences of white clothing. When a dark item is dyed, the manufacturer sets the dye to make sure that it stays on the fabric, but some of the dye doesn't set. When this item is washed, some of that un-set dye may come off and redeposit itself on surrounding clothes. If the dye redeposits on a dark item, the dye will not be visible, but if the dye redeposits on a white item, the dye will change the color. It is generally not permanent, but sometimes the heat of the dryer can set the newly redeposited dye into clothes.

Answer 2

Dark laundry may sometimes transfer color onto lighter laundry due to not separating colors properly before washing. This can happen if the dark clothing bleeds or if the water temperature is too high. To prevent this, it's important to separate darks from whites, use cold water for dark laundry, and consider washing new dark items separately the first few times.