So i was testing CYA the other day, but had no sunlight, and i was thinking oh well i'll test anyways see what i get. Then i started wondering why sunlight, back to it, waist high and took my speed stir into the bathroom, put test tube with black dot on it turned off light and performed test in darkness except for speed stir light. I got the same reading i got outside (no sun).
So if i wanted to, would performing the CYA test in darkness with the speed stir light give me more accurate readings over time as i'm eliminating some of the variable factors like sunlight, shading the tube etc.? Or not?