Question

question 3
3 tries left
what accounts for the limited color palette that john sabraw uses?
mixing acrylic and oil paint
adding black pigments
using recovered sludge from toxic iron oxides
using only primary colored pigments

Explanation:

John Sabraw uses recovered sludge from toxic iron oxides which limits his color palette as the material has inherent color - related constraints.

Answer:

using recovered sludge from toxic iron oxides