1. Kev sib tham ntawm cov hmoov ntxhua yog carcinogenic, yog tshuaj lom, muaj txiaj ntsig tsis yog lub tswv yim ntawm kev tiv thaiv ib puag ncig hnub no. Tau tshwm sim ntau zaus hauv keeb kwm. Txog rau thaum kawg no, xyoo 1945, tebchaws Asmeskas tau ntsuam xyuas kom muaj 6 tus txiv neej noj qab nyob zoo, txhua txhua hnub ntawm 100 mg sodium alkyl benzene sulfonate, nrog 120 hnub sib law lias, kev kuaj pom tau tias tus kab mob hemoglobin, cov qe ntshav, plab hnyuv ntxwm tsis tau hloov lawm.
2. 1960 University of Chicago oncologist spike Dr, Dr tus hnav cov tshuaj txhuam ntev xws li tsiaj tej tawv nqaij smear thiab qhov ncauj kuaj, paub meej tias qhov tshuaj ntxhua tsis yog carcinogenic, teratogenic teebmeem.
3. Xyoo 1963, rov hais dua ntawm cov kws tshawb fawb hauv Teb Chaws Asmeskas, Lub Tebchaws Yelemees, thiab tuaj txog tib lub sijhawm.
4. 60 ntawm lub xyoo dhau los, Oriental Professor of Mie University muaj peb qhov zoo nkauj ntoo ntawm ntxuav hmoov rau cov lus teb rau cov lus nug tau tsim tawm, Japanese Tsoomfwv tau tso cai rau University of Nagoya, Mie University, Hiroshima University, Kyoto University kev kuaj mob, tom qab 8 lub hlis , sodium alkyl benzene sulfonate proved tsis muaj teebmeem teratogenic rau ntawm fetus.
5. Tom qab, lub tsev kawm ntawv kho mob ntawm Tokyo University thiab 10-20 ntawm ob lub tshuab ntxhua ntxhuav nrog cov neeg ua haujlwm rau cov neeg ua haujlwm, cov neeg ua hauj lwm ntawm 279 tus neeg tau ua ntau cov kev ntsuas hauv kev tshawb nrhiav hauv lub siab, tag nrho cov kev sim ua txhua yam zoo.
6. Lub Plaub Hlis 1973, nyob rau lub rooj sab laj thoob ntiaj teb, lub koom haum World Health Organization hauv Switzerland, cov tshuaj ntxuav tais diav (xws li muab cov tshuaj fluorescent kua muag) tsis yog cov carcinogenic, cov teebmeem teratogenic mus rau qhov xaus.