Kev ntim iav yog ib qho kev xaiv nrov tshaj plaws rau ntau qhov kev lag luam sib txawv. Iav yog kev tshawb fawb pov thawj tias muaj tshuaj lom neeg ruaj khov thiab tsis muaj tshuaj tiv thaiv, uas yog vim li cas nws thiaj li muaj Kev Pom Zoo Raws Li Kev Nyab Xeeb (GRAS) los ntawm US Food and Drug Administration.
UV teeb tuaj yeem ua teeb meem loj rau ntau yam khoom. Txawm hais tias koj txhawj xeeb txog cov khoom noj khoom haus zaum tawm ntawm lub rhawv lossis muaj cov khoom siv uas yooj yim tsis tuaj yeem cuam tshuam nrog UV raug, nws yog ib qho tseem ceeb rau kev nqis peev hauv ntim rau cov khoom lag luam. Cia peb txheeb xyuas cov xim iav ntau tshaj plaws thiab qhov tseem ceeb ntawm cov xim no.
Amberiav
Amber yog ib qho ntawm feem ntau hues rau cov xim iav ntim. Amber iav yog tsim los ntawm kev sib xyaw sulfur, hlau, thiab carbon rau hauv lub hauv paus iav mis. Nws tau dhau los ua ntau yam tsim nyob rau hauv lub xyoo pua puv 19, thiab tseem nrov heev niaj hnub no. Amber iav yog qhov tshwj xeeb tshaj yog thaum koj cov khoom yog lub teeb rhiab heev. Cov xim amber absorbs teeb meem UV wavelengths, tiv thaiv koj cov khoom los ntawm lub teeb puas. Vim li no, amber xim iav feem ntau yog siv rau npias, qee yam tshuaj, thiab cov roj tseem ceeb.
Cobalt iav
Cobalt iav ntim ib txwm muaj xim xiav sib sib zog nqus. Lawv yog tsim los ntawm kev ntxiv tooj liab oxide los yog cobalt oxide rau hauv qhov sib tov. Cobalt iav tuaj yeem muab kev tiv thaiv txaus tiv thaiv UV lub teeb vim tias nws tuaj yeem nqus tau ntau lub teeb piv rau cov iav ntshiab. Tab sis, qhov no nyob ntawm hom khoom koj ntim. Nws muab kev tiv thaiv nruab nrab thiab ib yam li amber, nws tuaj yeem nqus tau UV hluav taws xob. Tab sis, nws tsis tuaj yeem lim lub teeb xiav.
iav ntsuab
Lub raj mis ntsuab yog tsim los ntawm kev ntxiv chrome oxide rau hauv cov dej sib tov. Tej zaum koj yuav tau pom npias thiab lwm yam khoom zoo sib xws tau ntim rau hauv cov thawv iav ntsuab. Txawm li cas los xij, nws muaj kev tiv thaiv tsawg tshaj plaws tiv thaiv qhov teeb meem ntawm lub teeb piv rau lwm cov xim iav tinted.Txawm hais tias cov iav iav ntsuab tuaj yeem thaiv qee lub teeb UV, lawv tsis tuaj yeem nqus lub teeb ntau npaum li cobalt thiab amber.
Thaum lub teeb yog ib qho teeb meem, nws yog ib qho tseem ceeb kom tau txais cov yas thiab iav fwj rau koj cov khoom. Peb pab neeg tuaj yeem ua haujlwm nrog koj txhawm rau txheeb xyuas cov fwj muaj lossis cov thawv ntim khoom uas ob qho tib si saib zoo thiab tiv thaiv koj cov khoom.
Koj Tseem Nyiam
Lub sij hawm xa tuaj: 10 Lub Ib Hlis-28-2021
