Ammonia test turned test tube yellow

NewAtFishKeeping

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I was careless this morning and didn't wash my test tube out right away after testing for ammonia. Now the tube has a yellow tinge. Can I still use this tube for ammonia testing? I rinsed it a couple of times with hot water.

Thanks!
 

AvalancheDave

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You could try cleaning it with an acid then a base or just make it your dedicated ammonia test tube keeping in mind that the stain might affect the reading.
 

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