Ua hoʻomaka ka hoʻihoʻi hou ʻana o ka noi ʻoihana lalo.Ua piʻi aʻe nā kumukūʻai o nā mea maka meta-phenylenediamine, cobalt chloride, a me ka cobalt sulfate.

Ua hoʻololi ka nui o nā mea hana kala i kā lākou kumukūʻai.Ke piʻi aʻe ka noi no ka m-phenylenediamine, e piʻi aʻe nā kumukūʻai o nā disperse dyes a me resorcinol.