I’m still trying to find or come up with an appropriate name for this type of pinhole photo. It is a type of “solargraph”, but the image is formed by more than just the sun burning into the paper. The image is created on black and white photographic paper in a pinhole camera (same as a solargraph), exposed to the sun, rain, ice, humidity, heat and cold for several days, weeks or months. All of nature’s elements, not just the sunlight, interact to form the final color negative image. Controlling the amount of water that the paper is exposed to has been the most difficult part. I’m trying out the term “photochemogram” for now, though this term usually excludes the use of a camera.
The image below was made this past spring in a camera made of paper mache. It was left in the woods for about a month.