that basically matches up a photograph that was taken of him in 1872 by alexander gardner. >> how aboutds. the one that you're looking at right there was probably actually done with ink. now, the pigments could be anything from artist pigments that were traded to the tribe or mineral pigments that were made by tribal members, you know, in the area. some of the black is ash. the red, however, is not vermilion. vermilion that was traded at the time is a mercury oxide and we tested this red to see if it had mercury in it because it's a toxin. and it's not. even though it's a very brilliant color, it's not vermilion. >> what is the material that the tepee is made out of? >> this is a bison hide tepee. there's 14 hides on here. it's all sinew-sewn. some of the splotchy areas like you see here is from conversation that was done to the tepee in the early 1980s. this is actually commercial tin deer hide that's been made to adhere for loss and then kind of distressed to blend into the original hide. so it's a little rough for wear, but considering it may have been made as early as 1855 originall