Why colors bleed
Some dyes are less stable when garments are new, dark, heavily saturated or exposed to warmer water and long agitation. The risk is not determined by color name alone, so a new red shirt and an older colorfast red shirt may behave differently.
Sort new and uncertain dyes separately
Wash new dark or saturated garments separately for the first washes when the label or manufacturer recommends it. Keep obvious dye bleeders away from whites, pastels and other items that would be difficult to recover.
Use the care label and conservative settings
A lower temperature and suitable cycle can reduce stress on many colored garments, but the sewn-in label remains the upper boundary. Use a detergent appropriate for the load and avoid overpacking so rinse water can move through the fabrics.
Catch transfer before the dryer
If you see transferred color after washing, separate the source and affected pieces and rewash promptly using compatible directions. Avoid dryer heat while you are still trying to remove unwanted dye because heat can make recovery harder.
Use a decision tool instead of guessing
The Wash Together Checker combines color groups with new-dye and care-label conflict inputs. It does not guarantee colorfastness; it returns a conservative decision when the reviewed pairing is supported and tells you to separate uncertain loads.
Garment care labels, appliance manuals and laundry-product directions can be more specific than a general guide. Use them when they set a tighter limit.