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Old 03-16-2015, 01:17 PM   #1
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Under What Light do you Colour Match Tests?

So I never know exactly where I should be when checking these colours, especially on Nitrate tests.

I get very different colour when measuring under ambient light, when shining a torch at it, when standing with my back to a window, when holding a piece of white paper behind it.... Ect..

So where do you go to check this stuff?


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Old 03-17-2015, 02:14 AM   #2
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What ever you do just do the same every time! At least you will know if things improving or not


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Old 03-17-2015, 04:13 AM   #3
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Or do tests on brand new made up water and take a phot of the colour. And compare it to that?


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Old 03-17-2015, 05:02 PM   #4
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I would suggest day light or a day light balanced light bulb is your best bet. Just be consistent about it. That's why I went with Hanna testers especially for phosphates where your measuring down to .01ppm.


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Old 03-18-2015, 08:32 PM   #5
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Bright, white light with a bit of white paper behind tube. Oh, and I hold the colour chart upside down - no idea why that helps but works for me. Then a family meeting lol.
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