Idayi iyinhlanganisela yezinto eziphilayo, ngokuvamile lapho kunezimo zoketshezi ukuze kuqedwe ukusabela kwamakhemikhali, ngakho-ke idayi yokuqala yokwenziwa emhlabeni ithengiswa okokuqala ngesimo soketshezi, vele, ikhwalithi yedayi yokuqala enesilinganiso samanje ayikude, ingabhekwa kuphela njengohlobo lokuqala lwedayi yoketshezi namuhla. Ngaleso sikhathi, cishe u-20% wezimpahla wawuwuketshezi, futhi lawa madayi oketshezi ayeyidayi ye-VAT kanye namadayi e-mordant.

Ngo-1923, amaNgisi aqala ukwengeza izithasiselo ezikhethiwe kudayi wokuqala futhi ngemva kokugaya, enza idayi ehlakazekile enganyibiliki emanzini. Ngo-1910, iningi lamadayi lase lisusiwe futhi licutshungulwe laba yizimpuphu ezincane zobukhulu obuthile.

Ngokusho kwezincwadi zango-1924, ngaleso sikhathi cishe u-80% wokwenziwa kodayi kube yimpuphu ecolekile, amadayi e-VAT enziwe aba ububanzi obukhulu bokusatshalaliswa kosayizi wezinhlayiya, kusukela kokuncane kakhulu kuya kwezimpahla zodayi wempuphu ezingama-50um. Kodwa idayi yokuqala yempuphu inezinkinga zothuli olukhulu kanye nokumanzisa okuncane.

Ngemva kuka-1930, amadayi ohlobo lokusabalala athuthukiswe kabanzi, kodwa kusekhona amaphutha athile njengokulula kokuna kwemvula kanye nokuqina kokugcinwa okungekuhle.

Manje udayi oluwuketshezi ngemuva kokucubungula kahle ifomula yezakhiwo ezahlukahlukene isithuthukisiwe kakhulu, isikhathi sokugcina singafinyelela isikhathi esingaphezu kwengxenye yonyaka ngaphandle kokuwohloka, izindleko zokucubungula udayi oluwuketshezi ziphansi, kulula ukuzisebenzisa futhi bezilokhu zithuthukiswa.

Kusukela ngo-1950, ukuvela komshini wokusila kukhuthaze ukuthuthukiswa kobuchwepheshe bangemva kokwelashwa. Ukugaya okumanzi ngomshini wokusila kungathola izinhlayiya ezincane nezincane. Ngaphezu kwalokho, ifomula yokucubungula yathuthukiswa ukuze izinhlayiya eziyisisekelo zedayi zifinyelele cishe ku-1um, futhi ikhwalithi yemikhiqizo ekhiqizwe yinqubo entsha nemishini yathuthukiswa kakhulu, futhi ukucutshungulwa kwamadayi angancibiliki kwenza intuthuko enkulu.

Ngokuthuthuka kwemishini yamakhemikhali kanye nemishini yamakhemikhali, amadayi e-granular aqala ukuvela. Idayi e-granular ibonakala i-granularity engu-100 ~ 300 um, inezinhlayiya ezingenalutho futhi inezinhlayiya eziqinile, uketshezi lungcono kunodayi oluyimpuphu, ukumanzi, ukuhlakazeka, futhi inqoba nobuthakathaka bokuntanta kothuli lwedayi oluyimpuphu esibhakabhakeni, amafomu omthamo avele ngokushesha amukelwa umnyango wokukhiqiza nokusetshenziswa, manje amadayi amaningi acutshungulwa abe yimikhiqizo ye-granular.