Cave Drawings

In reading a bit about the the scientific anaylsis fo materials used to make cave drawings there some admiration for actual painter..or painters. One analysis pointed out that the crayons/paints/Chaulk used were manganese oxide minerals... minerals that were not availble in the cave painting areas. The speculation was that there were trade routes closeby to provide painting materials. But after watching and discussing the movie we now know that Engineers actually provided the materials(hausmannite, groutite, for example) From a scientific outlook only I wonder what composition of the painting materials used in the 7 examples that Holloway pointed out. Even if the painting were done at different times(who is to say the Engineers didn't sent a painting crew to do all the caves at once somehow pre-selecting the 'age' of each to make it seem like they were painted in different eras. In fact if you look at the scene Holloway points to the displayed cave painting you can see little numbers in each color telling the 'painters' what color to use. (this is in the special 4-D X-Ray Pak)