I get a lot of questions from readers who cannot understand why their vintage perfume has little things floating in them. I have definitely had my share of bottles that had the floaties in some of my old perfumes too. This is mainly due to the natural decomposition process of the perfume.
According to some of the questions I get from readers, they are afraid they may have unknowingly bought a counterfeit. While it is true that many modern counterfeits may have nasty bits floating in the suspicious fluid, there are perfectly reasonable explanations why you could find sediment in your genuine vintage bottle.
If you collect vintage perfume you will notice some of the resins tend to collect in the bottom of the bottle. The sediment is actually the natural oils and essences coagulating as they start to break down. The alcohol and water inside will probably start to evaporate slowly over time and you will be left with a thick, syrupy concentrated perfume residue inside.