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Use a computer.

A program like Photoshop can be used to evaluate color. If a piece of the same paper is used as a control, and others are left in the sunlight, by scanning them in as .JPG files or .TIFF files and then opening them in Photoshop, they can be analyzed with the eyedropper tool and will report a hexadecimal number. Those numbers can be used in Photoshop directly to build a gradation scale or Excel to form an indexed chart.

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15y ago

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