Idayi yi-organic compound, edla ngokubakho xa kukho iimeko zolwelo ukuze kugqitywe ukusabela kweekhemikhali, ngoko ke idayi yokuqala yokwenziwa ehlabathini ithengiswa okokuqala ngohlobo lolwelo, ewe, umgangatho wedayi wokuqala one-current ratio awukude kangako, unokuthathwa njengohlobo lokuqala lwedayi yolwelo namhlanje. Ngelo xesha, malunga ne-20% yeemveliso yayilulwelo, kwaye ezi dayi zolwelo zaziyi-VAT dyes kunye ne-mordant dyes ikakhulu.

Ngowe-1923, amaNgesi ongeza okokuqala izongezo ezikhethiweyo kwidayi yokuqala kwaye emva kokusila, enza idayi esasazekileyo enganyibilikiyo isasazeke emanzini. Ngo-1910, uninzi lweedayi lwalususiwe kwaye lwacutshungulwa lwaba yimipuphu emincinci yobukhulu obuthile.

Ngokutsho kweencwadi zowe-1924, ngelo xesha malunga ne-80% yedayi ecutshungulwa ibe ngumgubo ocolekileyo, iidayi ze-VAT zenziwe zaba luluhlu olubanzi lokusasazwa kobukhulu bamasuntswana, ukusuka kwizinto ezicolekileyo kakhulu ukuya kwi-50um powder dye. Kodwa idayi yokuqala ecolekileyo ineengxaki zothuli olukhulu kunye nokufuma okungamanzi kakuhle.

Emva kowe-1930, iidayi zohlobo lokusasazeka ziye zaphuhliswa ngakumbi, kodwa kusekho ezinye iziphene ezifana nokulula kokuna kwemvula kunye nokungabikho kozinzo kwindawo yokugcina.

Ngoku idayi yolwelo emva kokulungiswa kwefomula yeempawu ezahlukeneyo iphuculwe kakhulu, ixesha lokugcina linokufikelela ngaphezulu kwesiqingatha sonyaka ngaphandle kokuwohloka, iindleko zokucubungula idayi yolwelo ziphantsi, kulula ukuyisebenzisa kwaye ibisoloko iphuhliswa.

Ukususela ngo-1950, ukuvela komatshini wokugquma kuye kwakhuthaza uphuhliso lwetekhnoloji emva konyango. Ukugquma ngamanzi ngomatshini wokugquma kunokufumana amasuntswana amancinci nangakumbi. Ukongeza, ifomula yokucubungula iphuculwe ukuze amasuntswana asisiseko edayi afikelele malunga ne-1um, kwaye umgangatho weemveliso eziveliswe yinkqubo entsha nezixhobo uphuculwe kakhulu, kwaye ukucutshungulwa kweedayi ezinganyibilikiyo kwenze inkqubela phambili enkulu.

Ngokuqhubeka koomatshini beekhemikhali kunye nezixhobo zeekhemikhali, iidayi zegranular zaqala ukubonakala. Idayi yegranular ebonakalayo yegranular ye-100 ~ 300 um, ineesuntswana ezingenanto ikwanazo neesuntswana eziqinileyo, ulwelo lungcono kunedayi yepowdery, ukufuma, ukusasazeka, kwaye ikwayoyisa ingxaki yokudada kwedayi yepowder esibhakabhakeni, iifom zedosi zavela ngoko nangoko zamkelwa lisebe lemveliso kunye nokusetyenziswa, ngoku iidayi ezininzi zacutshungulwa zaba ziimveliso zegranular.