They used marble, bronze, and clay
Answer: a color wheel is a representation of colors that are arranged by their chromatic relationship, you can use color wheels in different ways one being that you can use it help show you complementary colors, or help you choose what colors you want to use on your art.
B.) Tempo , hope that i helped, if im wrong please correct me
Answer:
This instrumental technique is called double stops.
Hope this helps! :)