Upakkilesasutta
“Pañcime, bhikkhave, jātarūpassa upakkilesā, yehi upakkilesehi upakkiliṭṭhaṁ jātarūpaṁ na ceva mudu hoti na ca kammaniyaṁ na ca pabhassaraṁ pabhaṅgu ca na ca sammā upeti kammāya. Katame pañca? Ayo, lohaṁ, tipu, sīsaṁ, sajjhaṁ— ime kho, bhikkhave, pañca jātarūpassa upakkilesā, yehi upakkilesehi upakkiliṭṭhaṁ jātarūpaṁ na ceva mudu hoti na ca kammaniyaṁ na ca pabhassaraṁ pabhaṅgu ca na ca sammā upeti kammāya. Yato ca kho, bhikkhave, jātarūpaṁ imehi pañcahi upakkilesehi vimuttaṁ hoti, taṁ hoti jātarūpaṁ mudu ca kammaniyañca pabhassarañca na ca pabhaṅgu sammā upeti kammāya. Yassā yassā ca piḷandhanavikatiyā ākaṅkhati—yadi muddikāya yadi kuṇḍalāya yadi gīveyyakāya yadi suvaṇṇamālāya—tañcassa atthaṁ anubhoti.
Corruptions
“Mendicants, there are these five corruptions of native gold. When native gold is corrupted by these it’s not pliable, workable, or radiant, but is brittle and not completely ready for working. What five? Iron, copper, tin, lead, and silver. When native gold is corrupted by these five corruptions it’s not pliable, workable, or radiant, but is brittle and not completely ready for working. But when native gold is free of these five corruptions it becomes pliable, workable, and radiant, not brittle, and ready to be worked. Then the goldsmith can successfully create any kind of ornament they want, whether a ring, earrings, a necklace, or a golden garland.