TF-100 instructions

I know this is an older thread, but if the color changes on the TA test to red for a second but switches back right away, but then on the next drop the color changes and stays red, do I go with the last drop that made it stay red?
 
Actually, you continue to add drops until there is no color change and then subtract that last drop.
 
Actually, you continue to add drops until there is no color change and then subtract that last drop.
There was a color change at 5 drops, but it went back to green, and then on the 6th drop it changed and stayed red. Is my Alkalinity 50 or 60?
 

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