Louis Pasteur suav hais tias cov cawv txiv hmab qhuav ua qhov ntshiab tshaj plaws, haus thiab noj qab haus huv zoo tshaj plaws hauv ntiaj teb. Muaj qhov tsis nkag siab hais tias cov cawv txiv hmab qhuav yog kua txiv tsis muaj qab haus nrog tsis muaj qab zib ntxiv. Qhov tseeb, txhua lub cawv tso cai raws li qib kev ua tiav ntawm cov txheej txheem fermentation thiab kev hloov pauv ntawm cov cawv wort rau hauv cawv.
Lub tswvyim ntawm "cawv txiv hmab qhuav" yog qhov tshwj xeeb thiab tsis muaj feem cuam tshuam nrog "dryness-ntub" ntawm cov haus. Thiab li cas kua (uas yog cawv) yuav qhuav ?! Lub sij hawm "qhuav cawv" yog ncaj qha ntsig txog tshuab ntawm winemaking thiab txheej txheem fermentation. Txhawm rau kom muaj kev ruaj khov ntawm yav tom ntej cawv, winemakers feem ntau sim hloov txhua cov suab thaj hauv cov kua txiv txiv hmab (lossis pulp) rau hauv cawv. Cov kab ziab lub rooj yog hu ua cawv qhuav uas cov piam thaj yog zom los yog "qhuav." Cov cawv ntim ziab qhuav muaj li ntawm 3 txog 8% suab thaj, thaum khoom noj qab zib lossis cawv qab zib muaj feem qab zib. Feem ntau cov cawv qhuav muaj nyob ntawm 9 thiab 14 feem pua ethyl cawv, muab tau ncaj qha los ntawm cov piam thaj uas pom hauv txiv quav ntswv nyoos Lub zog ntawm caw yog nyob ntawm ntau hom txiv hmab thiab thaj chaw uas nws tau loj tuaj. Hauv Armenia, dhau lub hnub ntev ntev ntawm lub caij ntuj sov, cov txiv hmab ntawm cov txiv hmab ntau ntau ntawm cov piam thaj, thiab cov ntsiab lus cawv ethyl hauv Armenian cawv cawv nce mus txog 17%. Ntxiv rau ethyl cawv, cawv txiv hmab qhuav muaj ib tug xov tooj ntawm cov kev siv cov organic acids, xws li fructose, qabzib, vitamins thiab minerals. Nyob ntawm cov txiv hmab ntau yam los ntawm kev uas cov cawv txiv qhuav ua tau, lawv dawb, liab thiab liab. Tag nrho cov cawv qhuav tau muab faib ua qhov tsis txawv lossis tsis muaj hnub nyoog (npaj rau siv tam sim ntawd tom qab ua tiav ntawm kev ua tiav, kev lim thiab kev paub meej), vintage (nrog lub sijhawm kom tiav ib xyoo lossis ntau dua, nws yog kev coj los qhia txog xyoo sau qoob loo ntawm cov npe ntawm cov cawv no) thiab kev sib sau (nrog rau kev laus ntev, cawv dawb feem ntau muaj hnub nyoog 10-18 xyoo, thiab rov qab siv tau - 25-30). Nws tsis muaj peev xwm txiav txim siab txog qhov "dryness" ntawm cov cawv los ntawm nws cov xim lossis tsw ntxhiab tsw; koj tsuas yog paub tau tias ua li cas dej qab zib lossis dej qab zib yog thaum saj. Cov cawv feem ntau muaj cov suab thaj nyob hauv lawv daim ntawv lo. Rau cov cawv txiv ntoo qhuav nws yog tsawg dua 9 g / l. Fabkis txoj cawv qhuav yog sau npe nrog Sec, Italian - Secco, thiab Spanish - Seco.
