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Discussion Starter · #1 ·
I am playing around with some test kits and the API's Nitrate test kit is bothering me greatly: I cannot discern between the different colors. So I want to make reference solutions from which I can later use to compare to the actual test sample: liquid-to-liquid instead of liquid-to-paper.

My concern is the accuracy of the reference samples. Will they hold their colors over time or will the reactants/indicator continue to chemically react/degrade over time, thus causing the colors to gradually get darker/lighter as time passes.

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In other words, the API's Nitrate Test Kit calls for a 1-minute waiting period after adding solution #2 before you read the resulting color change (or lack thereof). Will waiting 2 minutes, 5 minutes, 7 hours, 1 month, etc. cause the solution's color to change more and more and more...ad nauseam?
 
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