yes, synthetic hair cannot be colored in any way. I'm surprised it didn't just melt with bleach on it.
DebbieS.

Ok, my mistake! An update on the situation:
- they were not "unbleachable" knots. They just needed a LOT longer than most knots I have dealt with. I won't say how much longer, incase anybody on this forum tries it and ruins their system... but I am a little bit curious why some knots take so much longer than others. Perhaps they are coated differently at the factory or something?