The reason why cactus fruit powder and surface are blue is that cactus fruit powder is blue.

There are many varieties of cactus fruit, and different varieties of cactus fruit have certain differences in taste and color. Common colors are red, yellow and cyan. If it is fresh and ripe blue cactus fruit, it is edible. If the cactus fruit is blue because it is not mature, it is not recommended to eat it, because it tastes bad.