Measuring Colour
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Nisi Natural Night Filter - YouTube
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Amazon.com : SAKOLLA 16 Pack Color Correction Gel Light Filter - Transparent Color Lighting Gel Filter Plastic Sheets, 8.5 by 11 Inches, 8 Colors : Electronics
Subtractive Color Mixing – L.R. Ingersoll Physics Museum – UW–Madison
Optical filter - Wikipedia
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Red and green filters, illustration - Stock Image - C050/8752 - Science Photo Library
