CM - 42 Duotone Effect Gradient Maps 2017069
https://creativemarket.com/designdell/2017069-42-Duotone-Effect-Gradient-Maps
42 Gradient Map adjustment layers to quickly get that awesome duotone look by placing your artwork in the psd file provided and turning the gradient map layer visibility on or off, or drag and drop the Gradient map layers into your own file!

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