There's nothing more frustrating than putting some whites in a mixed wash and finding one of the coloured items has run and dyed the whites. If that happens, there's very little you can do to rescue them. There is a slim chance of reviving them by washing immediately with Soda Crystals Laundry Boost (after removing the offending article of course). Here is more information from The Spruce.
We always recommend washing whites on their own. Although whites can usually take a hotter wash than coloureds, you may not wish to do that. If so, use Soda Crystals Laundry Boost to keep whites pristine.
Advice on washing coloured garments
- Don't overfill the drum (always leave at least a palm's depth at the top)
- Wash on a low temperature setting and preferably a lower agitation option eg 'Delicates'.
- Use a gentle product like our Liquid Soap (formerly Liquid Soap Flakes)
- Use white vinegar in place of fabric conditioner
- Hand wash heavily coloured garments or wash them on their own or with garments the same colour, at least initially. Again, Liquid Soap is ideal.
- Take particular care with red garments as it's particularly difficult to fix the dye.
Can you set the dye in fabric to stop them bleeding?
If the garment has been home dyed, then white vinegar may help to set dark colours, but it is unlikely to be always successful. Given the wide range of dyes that are used in commercial dyeing, it’s not possible to specify a fixative that will work with these.
This article by Mary Marlowe Leverette gives some handy washing advice on washing dyed items of clothing. It makes for sensible reading and could explain why you may experience a 'run', even with garments that have been washed numerous times.