Kumenyekanisha ibicuruzwa byacu bishya Solvent Black 5, bizwi kandi nka alcool ya nigrosine, irangi ryiza rya nigrosine ryirabura ryiza cyane kubyo ukeneye byose byo gusiga irangi inkweto. Iki gicuruzwa gikoreshwa cyane munganda zinkweto mugusiga amabara no gupfa uruhu nibindi bikoresho kandi twishimiye kubitanga kubakiriya bacu.
Solvent umukara 5, nanone yitwa nigrosine irangi ryirabura, hamwe na CAS OYA. 11099-03-9, itanga amabara yumukara mwinshi, azwiho guhuza no guhuza ibikorwa bitandukanye byinganda, nko gusiga amavuta, gutwika na plastiki. Umukara wa Solvent wakozwe muburyo bwihariye kandi urashobora gukoreshwa nkirangi ryinkweto zo muri Polonye.