Melanin, a pigment that gives hair its colour, is light sensitive and also ACTS as a type of conductor.
头发的颜色来源——黑色素，是一种光敏材料同时也是一种导体。
2
The live ones would have been green, but in alcohol the yellow pigment is the first to leach, giving them their present turquoise colour.
这种蛇活着时本来是绿色的，但是在酒精中，黄颜色首先被溶解掉了，因而呈现出现在绿松石般的颜色。
3
The laser energy removes the brown pigment, or melanin, from the top layer of the iris, and the blue eye colour emerges over the following two to three weeks.