Martell with Blue Ribbon is a famous brand brandy, and there are many counterfeit products in the market. Here are several ways to identify Martell's blue ribbon:

1. packing box: the bronzing characters of the real blue ribbon Martell packing box are flat and clear, while the printing characters of counterfeit products are generally blurred or not bronzed.

2. Bottle caps: Real blue ribbon Martell bottle caps have TM and R marks, while counterfeit products are usually missing or unclear.

3. Color: the color of Martell bottle with blue ribbon is amber. If the color is too dark or too light, it may be a counterfeit product.

4. Check the serial number: you can find the serial number at the bottom of the bottle and compare it with the serial number on the brand official website. If it doesn't match, it may be a counterfeit product.

5. Smell: Real Martell with blue ribbon has a typical aroma, while the taste of counterfeit products may be vague or uncoordinated.