Put it in a cup, add little bits of water until its paste. Take receipt, check how much it cost, Google boric acid, cry at how much cheaper it is and never order "flux powder" again ;)
Ha! 'Boric acid' sounds way heavier too.
@russmeyer started
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Put it in a cup, add little bits of water until its paste. Take receipt, check how much it cost, Google boric acid, cry at how much cheaper it is and never order "flux powder" again ;)