kjfhg Posted October 11, 2021 Share Posted October 11, 2021 I have noticed that the longer I wait to read my Co-op test strips the nitrate color changes. It will show one color at 1 minute and 2-5 minutes will have a darker nitrate color. The bottle says to read at 60 seconds but I'm nervous about the higher nitrate reading after a longer period of time. Advice and/or thoughts? Link to comment Share on other sites More sharing options...
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