Why is impressed with the film?
A camera allows us to capture all kinds of images. The light enters the device, which until then had been dark when you turn a device called a shutter. The film, which is inside the camera, is constituted by a strip of celluloid covered with silver chloride or bromide on one side. This film is struck by light rays. The silver containing precipitates, and obtained a latent image. But that picture is not visible, because in the short period of exposure to light does not complete the process. It is necessary to complete the work in the laboratory with the use of special chemicals, which finishes the transformation. This process is called revealed.
How do we transform the negative into a photo?
After developing the film, it removes all the silver chloride which has not been impressed by light to blacken the film is not. This is accomplished by reacting the silver chloride with sodium thiosulphate. Then re-expose the film to light. The bright parts become dark and vice versa. This gives an image similar to the real color.
What is negative?
The silver rush is a very fine powder dark. Because of this precipitation, the film areas most affected by the light will turn black, and the least affected will become clear. This is called negative
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