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Author: Charlie Cooke
Photo size: 2.3 Mpixels (6.52 MB uncompressed) - 1549x1472 pixels (5.2x4.9 in / 13.1x12.5 cm at 300 ppi)
Photo keywords: 30 seconds, chemical tests, cutting agent, marquis test, plain flour, Sam Drake, University of Derby
Published in: Chemical tests