We dye our yarn with light- and washfast acid colours. During the dyeing process, these are preserved by heat and acetic acid. Sometimes skeins still loose some colour afterwards, this goes especially for speckled yarns and intense coloured skeins as well certain colours.
You should keep this in mind, particularly when combining them with lighter colourways, otherwise you might find coloured spots on the lighter parts.
Therefore we always recommend to swatch. And to wash your swatch in cold water with a little wool detergent.
And if a skein bleeds, give it a wash. First wash it under running water and then leave it for a few minutes in a bin with cold water and just a bit of detergent (keep in mind, that some wool washes may leech out colour). Then rinse again and hang to dry.
Coloured fabrics often have a note on the label to wash them separately from other colours. Normally you should do the same with the hand knitted or crocheted projects, especially if you made them from hand dyed yarns. But sometimes you may want to use colour-intense and bright colours TOGETHER in ONE project. If you do so, handle the FO with extra care. That means: cold washing with a high-quality wool detergent (just a wee bit!).
Note: Preventing bleeding with vinegar is only effective in conjunction with heat – and you want avoid to avoid heat, won’t you?!
When you start a project and use different colours together, make a swatch! Not only to figure out how the colours match, but also to test for possible bleeding. This is highly recommended if you use dark and/or colour-intense yarns together with brighter colourways.