Re: ATM Annoying Cerium Oxide Residue

["glen youman" <gleny@starstream.net>]

I've had the same experience and believe it was due to pH and temperature.
I flushed my mix of CeO and mixed a new slurry and have not had the problem
since.

I was working with Pyrex.


---------------------
Glen Youman
Penryn, California
http://www.astrophotos.net/ - Home page
http://www.penryn-esd.k12.ca.us/ -Penryn School
http://astro.sci.uop.edu/~sas/ -Stockton Astronomical Society
http://www.darksky.org - International Darksky Association


----- Original Message -----
From: "Mark Holm" <mdholm@telerama.com>
To: <doug@dougbraun.com>; <atm@shore.net>
Sent: Sunday, June 30, 2002 9:10 PM
Subject: ATM Annoying Cerium Oxide Residue


>
> Now this is a queer thing.  I had exactly the same problem on 8-inch BVC,
but with zirconium oxide.
>   When I switched back to cerium oxide, no film.  Also didn't see any sign
of film with black rouge.
>
> I wonder if some other variable is involved such as pH of the polishing
slurry?  Don't have anything
> to measure pH with here just now.
>
> Mark Holm
> mdholm@telerama.com
>
>
>
>