Shroud Solo Show (Part 11)- Sunlight-Based Hypotheses (Proto-Photo, Shadow & Solar Reflex Models) + Bonus Part 11B on Boiling and Painting Emulsion Methods

In Part 11, I continue my analysis of the various "Ordinary Artistic" image-forming mechanisms/hypotheses, specifically focusing on hypotheses based on the involvement of sunlight as the image-encoding mechanism.  There are three fundamental types of such hypotheses; i) The Medieval Proto-Photograph (Proto-Photo) models (Picknett & Prince and Nicholas Allen), ii) Nathan D. Wilson's "Shadow" model and …