Strongly colored clothes can bleed their dye in the wash and discolor lightly colored things. As an example, one time my mom washed a red shirt with the whites and all the underwear came out pinkish.
Semi-related, you should also sort by what temperature you run the wash at. Whites like towels and sheets tend to be more tolerant of hot water, whereas things like cotton or wool are washed at warm or cold water. Likewise delicates like undergarments should be run on a gentler wash cycle.
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