Ko te pepa kauwhata waro he mea hanga mai i nga rawa waro graphite kounga teitei, ka taapirihia me nga puhui waro tino-waikawa-atete, kua parahia e te pehanga-nui, te whakamaaramatanga korehau, me te maimoatanga wera wera. He nui te kaha o te waikawa me te pāmahana, he tauhohenga waikawa phosphoric i roto i te umanga matū. He mea pai mo nga taika, nga taika rokiroki waikawa phosphoric me etahi atu taputapu. Ko te rauemi mata o te pepa kauwhata he graphite, e whai waahi nui ana ki te umanga....
Ngā Hua Hua : Waahanga whakaahua > Rauemi Whakairoiro