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Thread: Test tubes stained black...fix?

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    Test tubes stained black...fix?

    I left the chlorine test water in the test tube overnight, it turned black and also stained tube. I know they're cheap, but anyone know a way to get the stain out? Whys it turn black overnight anyway? Thanks!

    24' AGP, 54" - 13,300 Gallons at 47".
    AquaRay Cleaner
    Hayward Swimpro Voyager Filter/2 Speed 2 HP Pump

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    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Test tubes stained black...fix?

    3:1 water/muriatic acid mix will likely clean it..

    Just jeep it rinsed well after that.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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