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328 | page 2 | https://thedailydialectics.com/pdfs/328/328.pdf

as possible the solid remaining in the centrifugation probes. After about 20 minutes boiling the black suspension turns brown and after 1 hour the suspension is pored into a 500 ml beaker and put on the powerful magnet for 5 minutes. As much as possible yellow supernatant is discarded using the…