Dithionite ya sodiyumu (Na₂S₂O₄), ikigabanya gikomeye gikoreshwa nk'igitera umweru imyenda, ifu y'impapuro n'ibumba. Izwi kandi nka hidorosulifite ya sodiyumu. Isenyuka mu mazi ikarekura dioksyide ya sufuru. Mu gutera amarangi mu kibindi, igabanya amarangi adashonga ikayagira mu buryo bwa leuko bushonga. Iratera uburibwe; ibike ahantu humye kandi hafunze.