Unphotography

To produce a collection of work in answer to the title ‘Unphotography’, what is ‘unphotography’?
My idea of photography is an image that is created with the aid of light, so I have created images in complete darkness by placing different acidic foods onto negatives film.
I created light tight boxes each containing different foods that reacted with air, atmosphere and the film to create an image. They were left to ferment for 8 days and then developed.
The foods I have used are
Box 1: slices of lemon and rind.
Box 2: vodka and coke, both onto P3200 bw negative film.
Box 3: raw pork chop and mint sauce.
Box 4: raw slices of potato and ketchup, both placed onto 800 color film.