uwurokoka
Igikoresho gikora ni ugutuma ibikorwa vy’ibikoresho vy’ugutera imbere, guteza imbere inyishu y’ivyuma vy’ivyuma vy’ivyuma, izwi kandi nk’uguteza imbere igikoresho canke ivyuma bitera imbere mu gutera imbere .Igikoresho gikora cane cane gikozwe n’ivyuma vy’ivyuma n’ivy’ibinure, ikintu gihambaye cane ni uguhuza ibihimba vy’umubiri bita zinc oxide (3-5 n’aside staric (1-2 ibihimba).Ivyiyumviro vy’ugusohora zinc oxide mu guhingura, gukoresha no gusubirana kw’ibintu vy’imipira bishobora gutuma haba ingaruka mbi ku bidukikije no ku buzima bw’umuntu, cane cane ku bimera vyo mu mazi n’ibikoko bishobora gutera zinc . Kugira ngo ibimera bikora, binc bike canke sulfide itagira zinc (nk’ivyo bita zinc, zinc oxide oxide n’ubuhinga bwa magnesium oxide, n’ibindi .) birategurwa n’inguvu kugira ngo bisubirire bimwe bimwe binc oxide .Ivyivuyemwo vyerekana ko imiterere ya zinc n’ivyuma vy’umubiri vy’umubiri bishobora kugira uruhara rw’umuti w’isufi, ariko uburyo bwo kurwanya umunyu n’imiterere y’umubiri w’umupira si vyiza nk’ivyo mu buryo butaziguye{{10}