When doing the Taylor drop tests for things like TA and CH, do you stop the drops on the last drop that changes the color? or do you keep going for a more "darker" color? For example when testing TA, do you stop when it changes from green to "red" even though it's more of a pink then a red. Or do you keep going for a real "red"? Same for CH, do you stop immediately when it changes from red to "blue"? Because its more of a purple color then a true blue.