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This may be only tangentially-related:
The only safe way ("safe", mind you) I know of removing sticky labels
from glass is to keep around a solution of bacterial-laden water, which
eventually (~ 2 days) eats away the labels. I keep a gallon-size
container of it simmering away in my garage. It's started by throwing
several labeled bottles in the water, and letting them sit for a couple
of weeks. The smell when it's "live" is mildly sulfurous, and I wouldn't
serve the water to pets or people, but it's not egregiously offensive,
and I don't think it's dangerous (though I'm not sure of this).
Once the solution is "primed", I keep it going by putting in a little
paper (post-it note sized) once a week. It does wonders on paper and
plastic labels, so long as the stickum isn't too silicone-based. It takes
only a day to really release the labels to the point where a mild soap
solution will take everything off easily.
3M also sells some very good tar remover which takes labels right off.
I think that without knowing a bit more about what the emblem is, I
won't be able to help. Is it hard? Baked-on?
/************************************
Down with categorical imperative!
flutzpah@yahoo.com
************************************/
________________________________
From: Anthony Lapinski <Anthony_Lapinski@pds.org>
To: phys-l@carnot.physics.buffalo.edu; tap-l@lists.ncsu.edu
Sent: Monday, July 6, 2009 9:28:12 AM
Subject: [Phys-l] glass
For an optics demo, I want to remove a picture/emblem from a clear glass
without scratching the glass. Does anyone know of a good way to do this?
Will any chemical/compound work?
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Forum for Physics Educators
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_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l