The flower arm has just been painted black and gray. Why is it brown?

Tattoo machine is quick and labor-saving. Because of the low strength and high speed of the machine, the dark gray of the flower arm, like coffee, makes the needle unable to penetrate the skin, makes the needle mark only on the skin, but does not let the pigment penetrate into the skin, and wipes off the pigment with a wipe to turn it into coffee. Tattooing is to use a needle with ink to penetrate into the bottom of the skin and create some patterns or words on the skin.