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Color Developing Agent 4
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<p>The fourth in the series of color developing agents used in developing <a href="/facts/Color_photography/dqwVRGcn">color films</a>, commonly known as CD-4, is chemically known as 4-(N-Ethyl-N-2-hydroxyethyl)-2-methylphenylenediamine sulfate. In color development, after reducing a <a href="/facts/Silver/xXe41BGg">silver</a> <a href="/facts/Atom/FoQ4kGN5">atom</a> in a <a href="/facts/Silver_halide/uM8V4wJc">silver halide</a> <a href="/facts/Crystal/e2R2mk3E">crystal</a>, the <a href="/facts/Oxidized/Pyd5RVcj">oxidized</a> developing agent <a href="/facts/Chemical_reaction/GpqWlKrz">combines</a> with a color coupler to form a <a href="/facts/Color_dye/a1NSlcsG">color dye</a> <a href="/facts/Molecule/N9ljSfFq">molecule</a>. </p>