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É milagre !!!
E aparece com cores em papel preto e branco..!
No chemicals are needed in making a solargraph. Solargraphs diverge from a conventional pinhole photograph: the exposure times are much longer than we are used to do. The short exposure time of the latent photograph in pinhole photogaphy will be visible as normal in developing it. But in solargraphy after a long exposure all the tracks of the Sun are already visible on the emulsion. Although there is a piece of black and white photosensitive paper inside the pinhole camera the result will be in colour. The overexposured paper negative will be scanned in a dim room and the negative will be inverted on a computer.