You need to understand that blue light has no color. The light itself isn’t blue. Blue light is the wavelength of light which, when our eyes detect, our brain creates the color blue.

Is Bleu a color?

Bleu de France (Blue of France) is a colour traditionally used to represent France. Blue has been used in the heraldry of the French monarchy since at least the 12th century, with the golden fleurs-de-lis of the kings always set on a blue (heraldic “azure”) background.

Why is bleu cheese called bleu cheese?

This special mold creates the unique veins of blue or blue-green mold throughout the cheese. It is these blue veins in the cheese that gave it its name, as well as its signature sharp and salty flavor. These veins of mold, along with certain types of bacteria, also give blue cheese its special smell.