Nitrate (orange or red) - The Planted Tank Forum
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post #1 of 4 (permalink) Old 06-09-2013, 04:57 PM Thread Starter
Algae Grower
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Nitrate (orange or red)

I am having trouble determining the color when I test nitrate. First of all 10 and 20 look like the same color and 5 is only slightly less orange, so I really can't distinguish in the 5-20 range. No biggie.

Question - when I put the test tube near the reading chart it is 5-20, but if I take off the top and look down the test tube it's red 40-80. Should I be looking down the tube when testing or not?
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post #2 of 4 (permalink) Old 06-09-2013, 05:36 PM
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Look straight through the tube, like when you hold it against the chart. It appears darker when looking at it from above because the depth/length is greater than looking through the side of it.
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post #3 of 4 (permalink) Old 06-09-2013, 06:59 PM
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+1 on through the tube NOT from the top. If you have dry fertilizers use this link to "calibrate" your test kit. It will show you what the color actually is for a specific level.
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post #4 of 4 (permalink) Old 06-09-2013, 07:43 PM Thread Starter
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Thank you.
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