Question

A white coloured element used in development of photographic negatives

Answer 1

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The white coloured compound which is used in the conversion process or the development process of negative image to a coloured aka the regular image is Silver Halide. The compound can be either of the three Ag( Silver)+ Halide or halogen. Here the halogens are Chloride, Bromide or the Iodide.

Answer 2

Explanation:

The white coloured compound which is used in the conversion process or the development process of negative image to a coloured aka the regular image is Silver Halide.