Dole ne ka ga yumbu na siffofi da launuka daban-daban. Duk da haka, ka san dalilin da yasa yumbu zai iya gabatar da kowane nau'i na kyawawan launuka?
A zahiri, yumbu gabaɗaya suna da “glaze” mai sheki da santsi a saman su.
Glaze an yi shi da albarkatun ma'adinai (kamar feldspar, ma'adini, kaolin) da albarkatun sinadarai da aka gauraye a cikin wani takamaiman rabo kuma a nitse cikin ruwa mai slurry, shafa a saman jikin yumbura.Bayan wani zafin jiki na calcining da narkewa, lokacin da zafin jiki ya faɗo, yana samar da siriri mai gilashi a saman yumbu.
Tun fiye da shekaru 3000 da suka gabata, Sinawa sun riga sun koyi yin amfani da duwatsu da laka wajen yin kyalli don yin ado da yumbu.Daga baya, masu fasahar yumbura sun yi amfani da al'amarin na kiln ash a dabi'a yana fadowa a jikin yumbu don samar da kyalkyali, sannan kuma suka yi amfani da ash a matsayin danyen abu don yin kyalli.
Gilashin da ake amfani da shi wajen samar da yumbu na yau da kullum ya kasu kashi glaze na lemun tsami da feldspar glaze. Lime glaze an yi shi ne daga dutse mai glaze (wani kayan ma'adinai na halitta) da lemun tsami-flyash (babban bangaren shine calcium oxide), yayin da feldspar glaze ne. wanda ya ƙunshi quartz, feldspar, marmara, kaolin, da dai sauransu.
Ƙara ƙarfe oxides ko shigar da wasu abubuwan sinadaran cikin lemun tsami glaze da feldspar glaze, kuma dangane da zafin wuta, ana iya samar da launuka daban-daban.Akwai cyan, baki, kore, rawaya, ja, blue, purple, da dai sauransu.White ain ne a kusan colorless m glaze. Gabaɗaya, kauri na yumbu jiki glaze ne 0.1 centimeters, amma bayan da aka calcined a cikin kiln, shi zai yana manne da jikin ain, wanda ke sa ain yayi yawa, mai sheki, kuma mai laushi, ba ruwansa da ruwa ko samar da kumfa, yana baiwa mutane haske kamar madubi.A lokaci guda, yana iya inganta karko, hana gurbatawa, da sauƙaƙe tsaftacewa.
Lokacin aikawa: Afrilu-26-2023