Just got a new bottle of Taylor phenol red. 5 drops turns any water sample blood red. What is the proper number of drops to add to a Taylor comparator that came with a DPD test kit.
I have a year old HtH kit, and 3 drops of Taylor gives a similar reading to 5 drops of HtH.
I have a year old HtH kit, and 3 drops of Taylor gives a similar reading to 5 drops of HtH.