Ka hoʻohana ʻana i nā pigments alkaline acid iron oxide i nā ʻoihana like ʻole
ʻO ka puaʻa pohihihi ka hao oxide o ka ʻohana puaʻa, ʻokoʻa kona uliuli mai ka uliuli a ʻokoʻa hoʻi i ka uliuli o ke kai, he kala hoihoi a ikaika. ʻO Blue kekahi o nā kala kumu ʻekolu, a ʻo kona lōʻihi hawewe pōkole ʻo 450 ~ 500nm, nona ka hawewe pōkole. He hōʻailona ʻo Blue no ke ao pau ʻole a he manaʻo hohonu kona ma muli o kona kala pohihihi.
Hoʻohana nui ʻia ka hao oxide blue i ka asphalt, diatom mud, rubber runway, pena, ka inika, ka pena, nā puaʻa a me nā penikala, nā lole varnish i pena ʻia, ka pepa i pena ʻia, ke kala ʻana o nā huahana plastik, ka papahele o ka hale, ke kala ʻana o ka papahele.