Re: [ATM] Stripping to re-figure?

["Jeff Baldwin" <bald@centurytel.net>]

You can calculate the sagitta volume of the mirror, V=pi*r^4/(4R),  whee r 
is the radius of the mirror, R is the ROC of the center zone, and determine 
how much to pour onto the mirror, let it sit overnight, then dispose of it 
properly.  The stuff works great and no rubbing is required.
JBald

Jeff and Glenda Baldwin
Beaver WA
http://home.centurytel.net/bald



> Mike Lockwood wrote:
>
>> Ferric Chloride is a commonly used chemical for etching PC boards.
>> It's easy to get, and it won't hurt you if you get a few drops on your
>> hands.  It should, however, be disposed of properly.  Overall, it is
>> an effective, safe way to strip the coating off a mirror.  Put a paper
>> towel on the surface of the mirror, pour on only barely enough to
>> saturate the paper towel, and wait.
>
> Now that is clever!  Do the pouring slowly, so the solution has time to
> wick out to the edge of the mirror, and you minimize use of the ferric
> chloride.
>
> Mark Holm


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