Final answer:
The cave dwellers in the Black Canyon used natural resources and various tools to create and apply paint to the walls.
Step-by-step explanation:
The origin of the "paint" on the painted wall in the Black Canyon can be attributed to the cave dwellers who used natural resources to create paint. They ground rocks or clay by hand to create a fine powder and used binders such as animal fat, blood, bone marrow, spit, or water to turn the powder into a paste. The paint was then applied directly to the walls using various tools, including fingers, animal skin, clumps of moss, twigs, and animal hair or fur.