Hāʻawi nā mea hao hao i nā puaʻa ʻaʻole ʻawaʻawa, ʻaʻohe koko, pale i ka wā, a māmā.Hoʻohui ʻia nā oxide hao maoli i hoʻokahi a ʻoi aku paha o nā ferrous a i ʻole ferric oxides, a me nā haumia, e like me ka manganese, pālolo, a i ʻole nā ​​​​mea olaola.Hiki ke hana ʻia nā ʻokikene hao synthetic ma nā ʻano like ʻole, e like me ka decomposition thermal o nā paʻakai hao, e like me ka ferrous sulfate, e hana i nā ʻulaʻula;ka ua e hua mai i melemele, ʻulaʻula, ʻeleʻele, a me nā ʻeleʻele (e laʻa, ke kaʻina hana Penniman-Zoph);a me ka ho'ēmi 'ana o nā pūhui mea ola e ka hao (e like me ka nitrobenzene i ho'ēmi 'ia i aniline i mua o kekahi mau mea kemika) e hana i ka melemele a me ka 'ele'ele.Hiki ke hana ʻia nā ʻulaʻula ma ka calcining ʻana i nā melemele a ʻeleʻele paha.

He ikaika lākou i ka ʻoni a ʻoi aku ka opaque ma mua o nā kala ʻē aʻe no laila hiki ke hoʻohana pinepine ʻia ma ka ratio haʻahaʻa ma mua o nā puaʻa maoli.