READ MORE: • Experts reveal how to apply perfume correctly
And while part of the appeal when buying a perfume can often be in the pretty bottle design, Knitowski suggests covering fragrances with tin foil. He believes this will help them last much longer and preserve their potency.
The UK's fragrance ambassador for Dior, Carl Groenewald, agrees with Knitowski, telling the Daily Mail:
"Once a fragrance has been purchased and unopened it should be stored in a dry cool environment, preferably in its original box. If these rules are followed the fragrance should be protected and good to use for two years."
How to tell if your perfume has gone off
Groenewald suggests testing your scent on a tissue. "If it seems to smell sour, heat and oxidation many have broken down the fragrance molecules and then unfortunately the fragrance is unusable unless you want to smell of vinegar."