Idayi iyinhlanganisela yezinto eziphilayo, ngokuvamile lapho kukhona izimo eziwuketshezi ukuze kuqedelwe ukusabela kwamakhemikhali, ngakho-ke udayi wokuqala wokwenziwa emhlabeni uthengiswa kuqala ngendlela ewuketshezi, yebo, ikhwalithi yodayi yasekuqaleni enesilinganiso samanje ikude kakhulu, ingatholakala kuphela. kubhekwe njengendlela yokuqala yodayi owuketshezi namuhla.Ngaleso sikhathi, cishe amaphesenti angama-20 ezimpahla ayewuketshezi, futhi lawa madayi awuketshezi ikakhulukazi kwakungodayi be-VAT kanye nodayi be-mordant.

Ngo-1923, abaseBrithani baqala ukwengeza izithasiselo ezikhethiwe kudayi wokuqala futhi ngemva kokugaya, benza udayi ongancibiliki uhlakazeka emanzini.

Ngokusho kwezincwadi zango-1924, ngaleso sikhathi cishe amaphesenti angu-80 odayi acutshungulwa abe yimpuphu ecolekile, odayi be-VAT benziwe baba yizinhlobonhlobo zokusabalalisa usayizi wezinhlayiyana, kusukela ezintweni ezinhle kakhulu kuye kwezingu-50um ze-powder. uthuli oluyingozi kanye nokungemanzi kahle.

Ngemuva kuka-1930, odayi bohlobo lokuhlakazwa baye bathuthukiswa ngokwengeziwe, kodwa kusekhona ukushiyeka okufana nemvula elula kanye nokungaqini kahle kwesitoreji.

Manje udayi we-liquid ngemuva kwefomula yokucubungula eyenziwe kahle yezakhiwo ezahlukahlukene iye yathuthukiswa kakhulu, isikhathi sokugcina singafinyelela ngaphezu kwesigamu sonyaka ngaphandle kokuwohloka, izindleko zokucubungula udayi we-liquid ziphansi, kulula ukuyisebenzisa futhi ziye zathuthukiswa njalo.

Kusukela ngo-1950, ukuvela komshini we-sanding kuye kwakhuthaza ukuthuthukiswa kobuchwepheshe be-post-treatment.Ukugaya okumanzi ngomshini we-sanding kungathola izinhlayiya ezincane nezincane.Ngaphezu kwalokho, ifomula yokucubungula yathuthukiswa ukuze izinhlayiya eziyisisekelo zedayi zifinyelele cishe ku-1um, futhi ikhwalithi yemikhiqizo ekhiqizwa inqubo entsha kanye nemishini yathuthukiswa kakhulu, kanye nokucutshungulwa kodayi abangancibiliki kwaba nenqubekela phambili enkulu.

Ngokuqhubeka kwemishini yamakhemikhali nemishini yamakhemikhali, kwaqala ukuvela odayi abayimbudumbudu. i-drawback ye-powder dye uthuli luntanta esibhakabhakeni, amafomu okulinganisa avele ngokushesha amukelwa umnyango wokukhiqiza nokusetshenziswa, manje odayi abaningi bacutshungulwa emikhiqizweni ye-granular.