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Author: Charlie Cooke
Photo size: 2.4 Mpixels (6.91 MB uncompressed) - 1549x1559 pixels (5.2x5.2 in / 13.1x13.2 cm at 300 ppi)
Photo keywords: 30 seconds, chemical tests, cutting agent, marquis test, Sam Drake, starch powder, University of Derby
Published in: Chemical tests
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