How many colors of laser engraved silicone keys can be typed?

Four colors. According to the query related public information shows that in the era of touch-screen smart phones have not been popularized, around 2013, many cell phones and electronic dictionaries above the keys are laser engraving process, here I give an example of spraying laser engraved silicone keys, this key above the word, the color of the word is red, green, yellow and blue four colors, the Kin body is white, the laser laser engraving, the first oil spray, red, green, yellow and blue are each sprayed on the corresponding The color, and the color can not string color, so that there is a red, green, yellow and blue keys, and then the whole sprayed on a layer of white, so that is a whole block of white keys, red, green, yellow and blue are wrapped in the following.