How does film make negatives? : LUSENET : Ask William Photo : One Thread

Could you please explain to me in detail how film makes negatives. I am helping my daughter with a Science project about this and need some help. Thank you, Angi

-- Angela Freeman (, February 10, 2002


Camera film is a plastic sheet coated with grains of silver salts that are sensitive to light. When film is exposed in a camera, the silver grains are affected by light. During processing, a developer converts the grains back to silver, forming a negative image. The negative is made into a positive print by projecting it onto a sheet of paper coated with similar silver salts. After development, light areas on the negative become dark areas on the print and dark areas become light.

-- (, January 31, 2003.

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