The french artist georges seurat created a dark drawing of farmers finishing work in the twilight titled the ploughing using this waxy medium.

Conte Crayon

Explanation:

Georges Seurat was using the Conte Crayon waxy medium and that was his novel technique. Those crayons are alike to pastels but they are waxier. Because of that, they are easier to use and control, they are making less dust than usual.

This painting was made in 1882. and it was a painting of Post-impressionism. In the painting, we can see the twilight and the farmers. It is a dark drawing because we can't see the faces of farmers, the point of the painting is the twilight.  

Idk but maybe a camera?

A  documentary film  is a nonfictional motion picture intended to document some aspect of reality, primarily for the purposes of instruction, education, or maintaining a historical record.example:     20,000 days on earth