Quote Originally Posted by BrianShaw View Post
My example faded away, but was just cyanotype chemistry poured on xisting older concrete sidewalk, then coverred to dry. A big negative was used. A garden hose was used to "develop" the image.

The shame of it all is that I had so little interest in my experiment that I never photographed it. So all that remains is a memory.
I wonder if spilling some coffee or tea on that area might restore the image? The problem with cyanotypes is that they don't like alkaline environment, and cement is very alkaline. However, toning with tea or coffee might restore some of the image...