Homemade 4x5 Cyanotype Negative

This came out way better than I thought was possible. This is a forty hour exposure taken out my front window with a 4x5 Crown Graphic camera on a homemade cyanotype negative. The blue image is the cyanotype, it's a really old chemical photo process that you can mix by hand and spread on to a substrate - in this case card stock paper. I scanned the blue neg then desaturated and flipped to a positive in Photoshop and was shocked by how much detail it produced.