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Rockland Polytoner tones black & white prints any color, using color-coupling chemistry. It tones the black image without affecting the highlights. (Effect: A black tree against a white sky is toned with green Polytoner. The sky stays white; the tree becomes green).
Use it with black & white photographic papers and Liquid Light prints. This item contains red, yellow and blue couplers, which can be blended for secondary colors, and is concentrated to make 2 liters of working solution.