Färgfotopapper

Färgfotopapper is photographic paper designed to produce color images. It typically consists of a paper base coated with multiple layers of light-sensitive emulsions. Each layer is sensitive to a different primary color of light: blue, green, and red. When exposed to light, these emulsions undergo a chemical reaction. During the developing process, dyes are formed within these layers, corresponding to the colors captured by the camera.

The structure of color photographic paper is complex. It usually involves a base layer, followed by several emulsion layers containing silver halide crystals and color couplers. The blue-sensitive layer is often placed at the bottom, with a yellow filter layer above it to prevent blue light from affecting the green and red-sensitive layers. The green-sensitive layer is in the middle, and the red-sensitive layer is at the top. These layers are very thin and precisely coated to ensure accurate color reproduction.

When exposed to an image, light activates the silver halide in each layer according to its sensitivity. For example, a red area in the original scene will expose the red-sensitive emulsion. During development, chemicals interact with the exposed silver halide and the color couplers to form dyes. The yellow coupler in the blue-sensitive layer forms a magenta dye, the magenta coupler in the green-sensitive layer forms a cyan dye, and the cyan coupler in the red-sensitive layer forms a yellow dye. The amounts of these dyes produced are proportional to the amount of light recorded in each layer, resulting in a full-color photographic print. Modern färgfotopapper often uses sophisticated chemical processes to achieve vibrant and stable colors.