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Paint Research Station (PRS) Colour

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An arbitrary scale developed by the Paint Research Station (PRS) for grading the colour of shellacs and varnishes.

Items required: Lovibond® discs 241100 / 4/11 Bleached Shellac (3/8-1¾ units), 241120 / 4/11A Shellac APSHA (2-6 units), 241120 / 4/11B Shellac APSHB (6¼-9 units) to be used with the Lovibond® Comparator 142000 and a W680/OG/10mm fused optical cell.

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