1. Study a Chanel No. 5 bottle for inconsistencies. If the bottle has never been used, the spray tube will have a bubble in it--an indicator of genuineness. Chanel counterfeiters pour a lower-grade perfume from a large bottle into smaller ones, either fake "testers" or regular perfume bottles.
2. Look at the color of the liquid in the bottle. If it's cloudy, too light or dark, or has inconsistent coloring, there's a good chance it's counterfeit. Some fake Chanel No. 5 may even have debris floating in it. Always check the bottle contents before purchasing from a flea-market or street vendor.
