The berry is bluffing. Its familiar blue is not lodged in a blue pigment; it is assembled at the skin, where a pale wax layer redirects incoming light before the eye can read the fruit beneath. Light does the work. Under that film, anthocyanins supply the red-purple chemistry that the surface partly conceals.That is the clever part. Rub away the epicuticular wax, and the visual bargain shifts: the...More