Why did polaroid throw it away after taking the photo? What principle?

Because the imaging principle is that the liquid medicine in the liquid medicine bag in the white frame is evenly pressed onto the photographic paper by a roller, and the even distribution of the liquid medicine will be affected after being dumped. The slurry is made of a mixture of developing fixing agent, silver halide solvent and rubber.

After the exposure of the negative, the two bases are pressed by a pair of rollers at the same time, the plastic bag is crushed, and the slurry is evenly coated on the overlapping surface of the negative and the positive. A series of rapid chemical reactions will occur between the positive film and the negative film. Early Polaroid used tear-off labels. After tearing, the photos are wet, so many people like to spin quickly.

Holographic paper is widely used now, but the habit of tearing ring era is deeply rooted and passed down from generation to generation ... Although many people don't know why they want to dump photos for others to see, it is a bad habit, which will affect the imaging quality.

Extended data:

Polaroid (called Polaroid in Taiwan Province) is a famous brand of fast imaging camera.

Compared with ordinary cameras, the lens and shutter of the primary imaging camera (Polaroid) are no different. Because of its special working principle, the camera body of disposable imaging camera is also different. In order to transfer and charge, there are a pair of stainless steel rollers on the camera body, and the positive and negative film bases pass through the rollers.

Baidu encyclopedia-polaroid