Daniel Grohmann

Welcome to Wikimedia Commons, Daniel Grohmann!

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-- Wikimedia Commons Welcome (talk) 16:37, 10 November 2013 (UTC)

help plz

hi can some one help me plz i use aqua regia for extraction gold and i have Yellow crystal and green crystal ... what i shoud do to have gold metal Memarekabir (talk) 20:43, 1 December 2020 (UTC)