Question

The Romans mad portrait paintings from a durable mixture of pigment and hot wax. What was this mixture called?

Answer 1

The mixture is called ENCAUSTIC.
Encaustic painting involves using heated bees wax to which coloured pigments have been added. The liquid paste is usually applied to the surface of  prepared wood such as canvas. The method is also called hot wax painting. 

Answer 2

i think its encaustic but im not sure