[ATM] Fine scratches during polishing - Cures?

[J Killea <jkillea@yahoo.com>]

Things have been going pretty nicely during polishing of my 8" Pyrex mirror.  Tonight, however,
somewhere between the 11th and 12th hour of polishing, I:

1. rinsed the blank in water
2. lightly wiped it with a turpentine-dampened paper towel
3. removed the turpentine by lightly going over the mirror with a clean cheesecloth.
4. finished removing the remaining turpentine film by exhaling on the mirror and lightly wiping
away the condensation with same cloth.

Reading this, I have the feeling some people are gasping at the risk in this procedure, but that
CeO seems very tenacious, as is the turpentine redsidue!  In order for my laser polish test to be
useful, I feel like I have to clean the blank VERY thoroughly.

During the heavy breathing phase of this procedure, I noticed some very fine scratches near the
center and at about 2" out from the center (25% zone?).  Some of the "scratches" acually went away
with a bit of light rubbing with the cloth, but several did not.

So I think the questions I need to ask are:

A.  What is the most risk-ridden part of the cleaning process I've described, and 
B.  What is the safest, efficient way to clean up the mirror for a stringent polish test?  (I've
seen de-ionized water rinses mentioned, but my problem is really with getting the CeO to detach
from the blank's surface.  Any water is quite polar and I wonder if nonpolar solvents work better
for CeO-on-glass.)

Thanks to the group!  

Jay






		
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