melanotic mucosa in the entire colon Quantitative Analysis of Melanosis Coli Colonic Using Textural Patterns Melanosis coli in the elderly:
Description
They settled in the fertile valleys of Ulster and Orange, but that repose which they coveted was a long time denied them, for the Indians, jealous of the encroachments of the pale faces, harassed them continually

Kelly T, Kafitz KW, Roderigo C, Rose CR (2009) Ammonium-evoked alterations in intracellular sodium and pH reduce glial glutamate transport activity
Regulation of metabolism in Caenorhabditis elegans longevity

J Gen Intern Med 23(2):210213

And meth makers commonly cut their products with strong chemicals or medications (such as fentanyl or other opioids) to save money

PMID 25245960
