8 years ago
I'm no expert, but I'll tell you what I know. Well, it can mean different things.
Sometimes it's normal, because perfume has all sorts of chemicals at high concentrations. I had that with "Dune pour Homme". So it's normal for that one and I've seen it with other perfumes too. Sometimes the threads and colours go away of you move the bottle gently. But personally I don't care, I don't shake my bottles!
Other times it can mean that your fragrance has deteriorated, it's gone bad. How old is your bottle? I had one bottle from 1990 and someone put it in the window sill. Wrong decision! It was ruined and it smelled sour.. I couldn't see the colour but I expect that it had changed too. -- But also new fragrance can go bad, for example if you expose it to heat or sunlight. I had a tester vial of "Encounter" and I cleaned it with warm water. Immediately the colour changed. So if you expose your fragrance to heat or sunlight, it can go bad. With threads sometimes.
But... If there's only a little bit of threads and it still smells good, then No Problem.