j_sum1
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Repurposing glassware
I have come across some broken volumetric pipettes. I hate throwing stuff like that out. Seems like it might make a good ampoule or even better a gas
discharge tube.
I would luke to get rid of the things printed on them. No solvents I tried made any impression. But it does not appear to be etched. How are these
things printed and any suggestions as to what might move it?
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mangoman667
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As far as ampoules, they will work great for that purpose. Just make sure you put a nice, thick seal on it to avoid breakage. Other than that, I've
heard that some people use broken borosilicate for boiling chips. Maybe just crush some up into smaller pieces so it's easier to insert.
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Dr.Bob
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I have found, by accident, that concentrated sulfuric acid dissolves the printing on some pipettes, especially when mixed with DMSO. BTW, that
strips the paint off nearly everything, especially when boiling... But the chemistry works, which is even more amazing.
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j_sum1
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Conc sulfuric did nothing.
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Chemosynthesis
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Was it a commercial drain cleaner? Drain cleaners sometimes have buffers.
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j_sum1
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Nope. LR grade H2SO4 at the school where I work.
I didn't leave it soaking or anything though. Prolonged exposure may be different.
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hyfalcon
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Heat it while soaking. HOT sulfuric has stripped the ink out of engraved marks on one of my thermometers.
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HgDinis25
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Like some have stated, Sulfuric Acid usually does the trick. Heat it to decomposition temperature for further attack on the ink. You may also consider
Piranha Solution, if you have access to concentrated H2O2.
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chemrox
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Piranha is expensive and ephemeral. Try what Dr. Bob suggested. Boiling sulfuric and DMSO... btw, what buffers in acid drain cleaner!? That would be
counter-productive. How would you 'buffer' con H2SO4? to pH 0.01?
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
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Little_Ghost_again
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I use the glass tube bits as stir bars etc, just put some metal rod inside, melt the glass closed then cut.
I was lucky enough to have some broken ones amongst some other stuff, really handy things! I left the paint on though
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HgDinis25
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Quote: Originally posted by chemrox  | | Piranha is expensive and ephemeral. Try what Dr. Bob suggested. Boiling sulfuric and DMSO... btw, what buffers in acid drain cleaner!? That would be
counter-productive. How would you 'buffer' con H2SO4? to pH 0.01? |
I'm sorry, did you just say that Piranha solution is expensive and went on encouraging the use of DMSO?
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