Re: [ATM] incomplete mirror stripping

["Bill Wheaton" <junkwheaton@gmail.com>]

Lemon Pledge? Saddle Soap? Toenail? Kielbasa? :)  Too funny!
Seriously, I'm interested too, I've got two 6" mirrors I might do that for.



On 5/6/08, Tom Conlin <tomc@cs.uoregon.edu> wrote:
> Hi Pete
>
> Would you elaborate on this "polishing compound"
> is it a silver polish? cerium oxide? shoe polish?
>
> lenses@adelphia.net wrote:
> > Hi Tom,
> > Take the mirror and clean it with cotton balls and polishing compound.
> > DO NOT RUB, just go over the entire mirror with this solution.
> > Then put it back into the acid (face up) and let it sit.
> > You can also gently rub on the remaining coated surface with q-tips.
> > You might have to do this a few times to get the entire coating removed but this is the safe way.
> > If it doesn't come off stop & send it off to the coater with the to be stripped note.
> > Or if you want to be daring there is another method that will preserve the surface and should remove the coating spots.
> > Good luck, let us know how it works.
> > Pete
> > lenses@adelphia.net
> >
> > ---- Tom Conlin <tomc@cs.uoregon.edu> wrote:
> >> Hi list,
> >> I recently tried my hand at stripping a couple of mirrors.
> >>
> >> The first a home made 8" F8 of un-determined age
> >> (old yellowish Pyrex?) the coating was translucent where
> >> it wasn't flaking off.
> >> Gave it a dilute Hydrochloric /copper sulphate bath and
> >> the coating fizzed off completely in two or three minutes.
> >>
> >> Bolstered with the success I had with my 8" I volunteered to do
> >> a 6" F8 from Edmond Scientific (circa 1960) for someone else.
> >> This time the process took much longer and even after a half hour
> >> some material remains on the mirror.
> >> I attempted to gently swab an offending spot with a Qtip
> >> but it remains fast.
> >>
> >> The first mirror was not in that great shape, poor figure and scratched
> >> so I have reground it, but this second one ... is not mine, looks ok
> >> and I would really rather not mess with it.
> >>
> >> So any recommendations on how to remove the last stubborn vestige
> >> of the old coating?
> >>
> >> Should I just leave it and let the coaters blast it off some how?
> >> or is there a more effective chemical bath I could try.
> >>
> >> there is a small Ronchi image (73k) of the stripped mirror here
> >> http://www.uoregon.edu/~tomc/astronowanabe/ronchi/IMG_2390_crop.jpg
> >>
> >> and a short but largeish (33M) video clip here
> >> http://www.uoregon.edu/~tomc/astronowanabe/ronchi/IMG_2393.AVI
> >>
> >> I can put up a direct image of the spots it that would help.
> >> --
> >>            ... nice weather     eh          tomc@cs.uoregon.edu
> >>
> >> _______________________________________________
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>
> --
>           ... nice weather     eh          tomc@cs.uoregon.edu
>
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