-Tsanangudzo:Dhayi isinganyungudike mvura iyo inoshandurwa kuita fomu inonyungudika nekurapwa neinoderedza mumiriri wealkali yozodzoserwa kuita isinganyungudika neoxidation.Zita rekuti Vat rakatorwa kubva mumudziyo mukuru wemapuranga pakatanga kuiswa dhayi.Dhayi yevat yepakutanga ndeye indigo inowanikwa kubva kune chirimwa.

-Nhoroondo: Kusvika kuma1850s, madhayi ese aiwanikwa kubva kune zvakasikwa masosi, kazhinji kubva mumiriwo, zvirimwa, miti, uye lichens ane mashoma kubva kuzvipembenene.Kuma1900 Rene Bohn kuGermany akagadzira netsaona dhayi yebhuruu kubva kuANTHRA chiitiko, yaakatumidza se INDIGO dhayi.Mushure meizvi, BOHN nevaanoshanda navo vanogadzira mamwe akawanda VAT DYES.

-General zvimiro zveVat dhayi:Insoluble mumvura;Haikwanise kushandiswa zvakananga pakudhaya;Inogona kushandurwa kuita mvura soluble form;Iine hukama kune cellulosic fibers.

-Zvakaipa:Mumvuri wakaganhurwa (mumvuri wakajeka);Sensitive to abrasion;Complicated application procedure;Slow process;Haina kunyanya kukodzera mvere dzemakwai.