API liquid tests, wait 5 mins, how long results good for?
Using the API freshwater master test kit.
You know how it says to wait 5 minutes (for color indicator solution to mix) before reading test results (Ammonia, Nitrite, I think Nitrate too), well I was wondering if there is any time limit to check the test results.
For example, sometimes when I test tank water, while the tests are waiting that 5 minute period, I am busy doing other tank duties and so, sometimes I don't get around to checking the test results until 10-15 minutes later (even sometimes longer). I do try to check as close to the 5 minute mark most of the time, just sometimes I don't. So I was wondering if the test results are still reliable/valid after how many minutes, or hours even, after the liquids were mixed.