According to the instructions, when doing a CH test the water is supposed turn from red/pink to blue. But when I do mine, the water turns clear, and no matter how many additional drops I add (20, 30, 50) the sample doesn't seem to change color at all. It just remains clear. Sometimes I convince myself that there's a faint tint of blue, but I'm never quite sure.
Should I be expecting an actual blue color or just the absence of red?