What is the tradition behind using a red cape for Bull fighting & can Bulls really see colors?

Question

Watch a news report about 3 Bull fighters that where cored by Bull & a reporter possed this ?; found it extremely interesting.

Answer 1

Bulls are colorblind. To a bull's eye, a red cape is a gray cape. The red cape, which inspired the phrase "seeing red," is purely a theatrical tradition.
However, to a bull bred exclusively for aggressiveness, that flapping cape can prove very irritating. As this post from the Washington University Medical School astutely notes, animals bred for bullfighting are tested around the age of three for aggressiveness before they go into the ring. The orneriest ones make the cut.

It's also worth pointing out that the animal in question has already been stabbed several times at the base of the neck. This happens early in the bullfight, and is performed by a gentleman known as a "picador."

Two kinds of capes are used in bullfighting. The capote is a large, flowing cape which is magenta and yellow. The muleta, a smaller red cape, is used exclusively by the matador for the faena, or the final, fatal segment of the bullfight.

Answer 2

Bulls are color blind. The movement of the cape is what gets their attention. The cape could be green with pink polka dots for all they know.

Answer 3

It makes an impressive display for the people watching.
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Answer 4

it is the movement that gets them going. they are colorblind.