Top-tone is adding White to the color. Under-tone is adding clear. Mass-tone is thick out of the tube. Transparent is clear like colored glass. Translucent is floating colloidal compounds of colored elements.
Milk is translucent.
Opaque is dense and light blocking, like a rock. Tint Mass Ult. Mass Burnt Sienna Mass Cad. MMCC, Blocks French Ultramarine Blue, translucent 27. Translucent These are the colors to mix to make a neutral dark from Blue and Yellow pigments.