[...] water medium, incubate for 48±2 hours, and then add several drops of methyl red indicator liquid to observe the immediate color change: bright red or tangerine colour change indicates positive result, while yellow color change indicates negative result. cmchk.org.hk 甲基紅試驗(M) 取...
[...]water medium, incubate for 48±2 hours, and then add several drops of methyl red indicator liquid to observe the immediatecolorchange:bright redortangerine colour change indicates positive result, while yellow color change indicates negative result. ...