What type of painting medium did early folks use to paint on the wall caves?

What type of painting medium did early folks use to paint on the wall caves?

Iron oxide pigments were highly valued for their durability, and prehistoric mining trails around the famous Lascaux Cave in France suggest that, 25,000 years ago, painters traveled many miles for these materials. Early artists mixed their pigments into paint using water, saliva, urine, or animal fats.

What art is the most expensive?

Here's a quick recap of the 20 most expensive paintings in the world: