matthew stern is collaborating with marcus to take us through that and remind us what it was like to take pictures 100 to 150 years ago. >> oh that is so cool. >> see how he pours some of the chemicals on this metal sheet, just gently swirls it around. >> must be like photo reactive. once you flash it the light is going to hit it, it will imprint the image and you process it. >> exactly. the fact that somebody way back when figured all this stuff out is really impressive. >> going to go through the entire process and going to be like taking a selfie. >> oh, no! >> that would be disappointing. >> marcus goes outside, gets his model in place, gives her a countdown and watch, watch how this works. it is not a push button. check it out. >> that's it. he takes the lens cap process fd to develop the image. after all of that, we wound up with an imageha quite frankly isn't that great. and you got to do it all over again. >> this is the slightly older version. we have 32 pictures and you take all the pictures and get them developed weeks later. >> marcus tries again and here is his second at