Uviniga wokhuni (i-pyroligneous acid): uketshezi olunsundu olumuncu oluhlangana lube ngamaconsi lapho ukhuni oluqinile lushiswa esitsheni sokucwenga esivaliwe; i-acetic acid engahluziwe ephethe itiyela. Lusetshenziselwa ukwenza uketshezi lwensimbi noketshezi olubomvu olubambelela umbala (i-acetate yensimbi ne-acetate ye-aluminium) ekudayeni nasekunyatheliseni izindwangu zikakotini, kanye nama-acetate afana noshukela womthofu.