It is actually caused by the molds (fungi) that give blue cheese its taste and color.
Andrew no beard
Mold
blue mold
mix rainbow cheese with cream cheese and food coloring
Blue cheese (or bleu cheese) is a cheese that has had Penicillium cultures added so that the final product is spotted or veined with blue-gray or blue-green mold.
A variety of Derby cheese that is called Sage Derby is mild, mottled green, and semi-hard. It contains sage, which gives it the green coloring and sage flavor.
The orange color of some cheese comes from compounds such as beta carotene (yellow) or spices such as annatto (orange). Most processed cheeses just add coloring.
Blue cheese gets the name from the veins of blue colored mold that go through it. It is intentional, as it is a cheese curd infected with penecillium to have that result, which also gives it the pungent flavor.
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Food coloring is flavorless; however, blue food coloring is often used to color raspberry flavored foods.
Stilton comes in two forms1) White Stilton2) Blue StiltonBlue Stilton is made the same way as White Stilton but the cheese curds have a mould (Penicillium roquefortii) added to them during manufacture and the cheese is kept for the mould to grow in the cheese. This gives Blue Stilton a marbling of blue veins running through it and a lovely creamy taste. The blue veining gives Blue Stilton its name. Only seven dairies, using the original centuries-old recipe, are licensed to produce the creamy ivory-hued king of cheeses. So esteemed is Stilton's unique flavour and texture, it is the only British cheese graced with its own certification trademark.
Roquefort contains Penicillium Roqueforti which is what gives it the blue mould veins. Camembert has Penicillium Candidum coating which gives it the white mould exterior. Save
Nacho cheese is yellow cause they put food coloring in 2 change the color of the cheese
Cheese is molded on purpose. The blue in cheese is the color of mold.