>>13810767Ok I'll try explaining why this is not an explanation
Firstly the post you're replying to was replying to a post that is about hair, so you are now changing the object to "dark coloured fibers" which isnt what I was discussing.
Furthermore this is not "a few" rather these are seemingly on almost all masks of this make, and various ones on each mask.
Next, you did not give a proper description of what it exactly is, why it reacts to heat and moisture as it does, why it's there etc
Thanks for attempting but the still looking for an explanation