Regular Member Captain Findus Goldfish Posted December 11, 2010 Regular Member Share Posted December 11, 2010 I have some older API test tubes that have started to take the bright yellow color of ammonia and the strong cyan of the nitrites. How do I get this stain away from the test tubes? 0 Quote Link to comment Share on other sites More sharing options...
Regular Member number20121 Posted December 11, 2010 Regular Member Share Posted December 11, 2010 I noticed that too, but I could just wipe it out. I took a piece of paper towel, rolled it up like a cigarette, stuffed it in the wet tube and kept twisting the paper towel. I got the test tubes all clean that way. I have to do this a lot because on of my bad habits is to not dump the tested water after testing, and then it sits there for a couple days until I need them again... 0 Quote Link to comment Share on other sites More sharing options...
Regular Member Captain Findus Goldfish Posted December 11, 2010 Author Regular Member Share Posted December 11, 2010 It doesn't seem to work - I think the color has tinted the glass! 0 Quote Link to comment Share on other sites More sharing options...
Regular Member blackteles Posted December 11, 2010 Regular Member Share Posted December 11, 2010 Test tube brushes would easily do the trick for removing residual stains. Here's a link to Amazon .com for these brushes. Amazon .com test tube brushes 0 Quote Link to comment Share on other sites More sharing options...
Regular Member Captain Findus Goldfish Posted December 11, 2010 Author Regular Member Share Posted December 11, 2010 OHHH got those! gonna try asap 0 Quote Link to comment Share on other sites More sharing options...
Regular Member caitie Posted December 11, 2010 Regular Member Share Posted December 11, 2010 I fill mine up with some hot water and lots of dish soap, let them sit for a few hours or even overnight and then I rinse very well and soak them in vinegar. Usually does the trick. 0 Quote Link to comment Share on other sites More sharing options...
Regular Member Captain Findus Goldfish Posted December 11, 2010 Author Regular Member Share Posted December 11, 2010 Dennis' trick worked!!! :bingo: 0 Quote Link to comment Share on other sites More sharing options...
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