If the light things in the real world are dark in the image, it's a negative. It works that way because the light changes the chemicals on film and photopaper, and makes them go dark. Since the light bits (in the real world) go dark on a negative, they stop the light from going through so you can develop the photo properly.
You need space, ventilation, running water, and a completely lightproof room - but the ventilation is especially important.
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Date: 2005-09-18 09:42 am (UTC)You need space, ventilation, running water, and a completely lightproof room - but the ventilation is especially important.