Assertion: carbon black's potential | /r/HasProperty | exhausted by late 18th century
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Source sentences:
text: India led the world in diamond production from the time of their discovery in approximately the 9th century BC to the mid-18th century AD, but the commercial potential of these sources had been exhausted by the late 18th century and at that time India was eclipsed by Brazil where the first non-Indian diamonds were found in 1725.