Kudiwa kweindasitiri yepasi kwakatanga kupora nguva pfupi yadarika.Mitengo yezvigadzirwa meta-phenylenediamine, cobalt chloride, uye cobalt sulfate yakwira.

Vazhinji vagadziri vedhayi vakagadzirisa mitengo yavo.Sezvo kudiwa kwem-phenylenediamine kuchiwedzera, mitengo yekuparadzira dhayi uye resorcinol ichakwira.