Thank you Wayne.
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Originally Posted by kronckew
casting sand for comparison: sand next to the metal gets burnt black, yours does appear to have some black specks. the bigger pebbles are atypical in casting material. may have dropped in for visit later & stayed.
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This material is thinner than sand and lighter than earth. Dark tone achieved after burning atempts gets darker, but not black. Only one minuscle pebble showed up after four samplings, not enough to be representative, i guess.