Just to clarify, washing with vinegar and/or salt will do nothing to 'set' the dyes that are now used in the production of cotton quilting fabrics (fiber-reactive dyes). They used to work, long ago, on acid dyes, but acid dyes are no longer used on cotton fabrics. Retayne will set fiber-reactive dyes (for use on uncut fabrics) and Synthrapol will suspend loose dyes (for use on cut and sewn fabrics), salt and vinegar will do neither.