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Thn̄g (碭; Eng-gú: enamel) sī kā po-lê hām hûi-chit iù-lia̍p-á iûⁿ-kiat tī ki-chit piáu-bīn só͘ hêng-sêng ê goā-khak. Ki-chit thang sī kim-sio̍k, hûi ia̍h po-lê. Thn̄g it-poaⁿ lóng sī kū-iú gē-su̍t bí-kám ê chhái-sek hoe-iūⁿ ê mi̍h-kiāⁿ, the̍h-lâi chò pó-hō͘ ia̍h chong-sek sú-iōng.