cyanuric acid test

[boscogabby]

When using a drop based test kit to test for cyanuric acid is the reading correct when the black dot just starts to disappear or when it completely disappears? I am using a Taylor test kit.

[Watermom]

When it completely disappears.

[bryjen]

When reading this, my reading is different in shade or overhead sunlight which is more acurate.

[CarlD]

Sunlight, at your waist.

[bryjen]

Thanks Carl. It does make a difference.

[waterbear]

actually, cya testing should be done by nothern light, not direct sunlight by everything that I have been able to find out about this test. I do it in the shade out of direct sun light but not in dark shade. (If you want to move this to the china shop it might be an intersting discussion.)