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Yellowness Index Measurement by UV-VIS

Yellowness Index Measurement by UV-VIS

Yellowness Index Measurement by UV-VIS

(OP)
I would like to measure Yellowness Index (YI) of glass/plastic/glass laminates by UV-VIS. I know you can buy software bundles that do lots of things in addtion to converting the UV-VIS measurements to YI values. Does anyone know the pertinent wave lengths and equation for doing my own measurement conversion to YI per (ASTM D1925)?

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