<http://purebibleforum.com/index.php?threads/discoloration-of-documents-stains-liquids-used-forensic-testing.109/>
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"Forensic Chemistry (1921)\nAlfred Lucas\nhttps://archive.org/stream/forensicchemistr00lucarich#page/78/mode/2up\n\nDiscoloration of Documents.\n\n  — Occasionally documents  are discoloured intentionally in order to give them a fictitious  appearance..."
<https://purebibleforum.com/index.php?threads/discoloration-of-documents-stains-liquids-used-forensic-testing.109/>