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Old 01-29-2004, 03:00 PM   #1
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A reminder to rinse those test tubes!

Last night I tested my water. Ammonia - no problems. Nitrites - no problems. Nitrates - no problems. pH - dropped a full point!!!

Okay, so it didn't really. I hadn't rinsed my test tube, and I guess the nitrite or nitrate test is a little acidic... I rinsed the test tube very well after that, found my normal pH, and picked my dropped stomach off the floor.

What an idiot!

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Old 01-29-2004, 03:03 PM   #2
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I rinse my test-tubes every time AND I labeled them with a diamond etching pen.
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Old 01-29-2004, 03:12 PM   #3
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Oh QTOFFER, you're just too good for me! I am pretty lax about which tubes I use, but I really do normally rinse them after every test. I guess I was lazy last night. No harm done at least.

BTW, what is a diamond etching pen?
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Old 01-29-2004, 03:19 PM   #4
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A pen that etches glass with diamonds?


and its hard to lable tests, to, when they come with 4 test tubes and 6 tests..
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Old 01-29-2004, 03:26 PM   #5
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When you work in a big lab, as I do, you become anal-retentive about lots of things!

A diamond etching pen is just a writing stylus encrusted with tiny industrial diamonds. They're great for writing on glass or hardened steel surfaces. Most art stores and hardware stores carry them for craft projects or for writing serial #s on your valuables.
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Old 01-29-2004, 07:51 PM   #6
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Oh, good idea! I want one
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