... dichloro dihydroxy benzenesulfonic acid change color. When H2O2 concentration is more than 2μmol/l in sample, the color becomes red ... of cassette)Normal over 2umol/l, red or purpleAbnormal less than 2umol/l, blue2). SNA (the middle hole of ... Chaoqian Road, Changping District,102200 Beijing, ChinaTel +86-10-69722840, Fax +86-10-69722840 Bacterial Vaginosis rapid test, biochemistry reagent, medical ...