- Lynn Picknett and Clive PrinceQuote
"Basically you project the image of your 'subject' via a lensed camera obscura (pinhole camera - a box with a hole in it) onto a piece of linen that has been coated in light-sensitive chemicals (among which is urine) and leave it for several hours to develop. Then you wash the cloth to remove the extra chemicals and heat it to 'fix' the image - and you have an image of the same vagueness and the same colour as the Turin Shroud."
Leonardo was a prankster, and didn't much care for religion. A prime suspect in my book.