Ubururu bwa Sulfure 7, igurishwa kandi nka Sulphur blue brn, ni irangi ry’ibanze rya sulphur rikoreshwa cyane mu myenda ya cellulosic nka ipamba, denim n’imyenda y’akazi. Ubwoko bwayo butandukanye bwa sulphur blue brn itukura bugaragara cyane hamwe n’ijwi ryihariye rishyushye ry’umutuku n’ubururu, riyitandukanya n’amabara akonje ya sulphur blue kandi ritanga ingaruka nziza z’umukara n’umukara nyuma yo gusiga irangi rya oxidation. Ibara ry’umutuku n’umukara n’umukara n’umukara mu buryo buhanitse 180% rifite imbaraga zo kongera irangi, rigabanya ingano yaryo mugihe rigumana ibara ry’umutuku n’umukara mu buryo bungana mu gukora byinshi.

Nk'irangi rya sulfure ridashobora gushonga, rishongera neza muri alcool igabanya sodium sulfide, rigafatana neza na molecules za fibre kandi rigatanga urumuri rwinshi n'ubudahangarwa bwo koga. Abakora irangi bakundasulfure y'ubururu 180%kugira ngo ikiguzi gikore neza: igipimo kimwe kigera ku burebure bungana n’ubw’ibara ry’ingufu zisanzwe, bigabanura ikiguzi cy’ibikoresho fatizo n’amazi yanduye. Ibara ry’umutuku rya sulfure rijyanye n’isoko ry’imyenda ya kera, ishyushye kandi yijimye, ijyanye neza n’ibikenewe mu irangi rya denim, ikoti n’iry’inganda.

Ubushyuhe bugenzurwa n'igihe cyo gushyushya bigenzura ibara ry'umutuku, birinda impinduka zitangana z'amabara. Guhuza imbaraga nyinshi zo gusiga irangi, ibara ry'umutuku ridasanzwe n'umuvuduko uhoraho, ubururu bwa sulfure 180%, ubururu bwa sulfure 7 naisupure y'ubururu bw'umutukubiracyari amahitamo y'ubururu bwa sulfure y'ingenzi mu miyoboro y'imyenda ku isi.