Red pigment is obtained due to high iron oxide red earth. For thousands of years, a bright red dye has been extracted from cochineal: to obtain 100 grams of pigment, about 14 thousand of these frayed insects were needed. They were collected from grass of a certain species or from a cactus.
With great difficulty, a purple dye was also obtained. It was obtained from the glands of the murex mollusk: for the sake of 100 grams of purple 100 thousand mollusks parted with life. Curiously, for humans, red is a danger sign, while most animals do not distinguish it at all. Birds are well seen in the red spectrum and, perhaps, therefore, flock to red fruits. Continue reading