Answer
Feb 28, 2025 - 09:03 AM
Our Sulky Cotton Blendables are colorfast, but they are NOT bleachable. (Our solid color cottons can be bleached.)
If a piece of clothing or material is color-fast, its color will not change or lose brightness when it is washed.
So, with either cottons or rayons, in the dark colors there could still be excess dye the first time it is laundered that could leech into surrounding fabric, just like a red garment that we would buy - we'd make sure we washed it with very dark clothing the first time, so nothing in the wash could turn "pink". Thread, of course, is a miniature version of that first-wash or wetness issue. Thereafter, though, you should not need to think about this again.
The key is using lots of water to rinse away any excess dye in the first washing. This only comes up when people might handwash an item the first time, and it is not sufficiently rolled in a towel so the bulk of the wetness is gone before laying it flat.
It is never an issue with thread in a wash machine, because of the volume of water used.
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