Bromothymol blue indicator has been used in conjunction with phenol red .
It is already blue at this point, and a few drops are used on the water slide.
A universal indicator is collectively a mixture of indicators which show a colour change in a solution, which interprets how acidic or basic a solution is.
Bromothymol Blue Indicator Solution; Aqueous Bromothymol Blue Indicator Solution: Dissolve 50 mg of bromothymol blue in 4 ml of 0.02 M sodium hydroxide and 20 ml of ethanol (95 percent). After the solution is effected, add sufficient water to produce 100 ml. Complies with the following test.
BROMOTHYMOL BLUE INDICATOR AR Supplier Oman Muscat Barka Salalah Sohar Ruwi Mutrah Nizwa Al Hamra Manah
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