Moscow Mule Biotek Pigment 0.5 fl.oz (15ml)norganic Liquid Eyebrow line Moscow Mule beautiful dark blond light brown. Moscow Mule pigment has a neutral undertone, which makes it perfect for use on all clients with light skin (phototype Fitzpatrick 2) and natural dark blond brow hair. The Inorganic Liquid brow line has a medium liquid texture, which makes them ideal for both hair by hair effects and for shading. The shades are neutral, perfectly balanced to obtain stable results on every type