Hi - i'm trying to get used to the method for the TA test.. When i have the water sample in the tube and u add the green drops, now your sample is green.. ok. Now, you add the red drops one at a time while stirring at the same time until the solution turns red. My question is, is it when your sample first turns red, because if I stop stirring at that point it goes back to green, or is it only when you first see red during stirs?
So in otherwords, mine turned to red at 8 drops or so (80ppm i think then), but if I stop stirring it immediately goes back to green... should I keep adding until it stays Red??