and you can see down on the yellow. >> this down here is the gertite. >> once it dries you have pigmentthis for? >> about 50 cents a pound and doesn't sound like much but from the single site we are working at we can generate over 2000 pounds of dry gertite a day and that water is good to into back into "the stream" and be good. >> take to take the pigment across campus and bringing the pigment in the lab to the art studio and turning the toxins from the creek into art. hi, john. >> hi, phil, good to meet you. >> thanks for having me and i brought you the tiniest dry sludge in ohio and i understand you have a use for it. >> i do and we do make a fine sludge in ohio, i'll tell you that much and we make paints out of it and it's the same kind of paint used for centuries and it's an easy process. this is a glass muller and you can feel the weight and a big piece of glass and what we do, very, very simple, we take a pile of this sludge pigment and take this lin seed oil and make a ring around it like this and we work from the center out. it's going to feel like it's hard but you got to put

as the reaction continues, the iron turns into an orange that painters call gertite. then it takes about five days for it to separate from the water. >> this is some after it is settled. you can see down on the bottom there is some nice, yellow -- >> so this down here? >> yes. >> once it dries, you've got pigment. >> how much can you sell this for? >> it's about $0.50 a pound. which doesn't sound like much but from the single site that we're working at, we can generate over 2,000 pounds a day. so that water's good to go back into the stream and be good. >> time to take our pigment across campus. >> i'm now bringing the pigment we made to the art studio where we're going to turn toxins from sunday creek into art. thanks for having me. so i brought you the finest dried sludge in ohio. and i understand you have a use for it >> yes. we make paint out of it and it's the same kind of paint used for centuries. you can feel the weight of this if you want to. big piece of glass. and essentially what we're going to do is very simple. we take a pile of this pigment. then we take