[ATM] Cerium Oxide Problem

[Kurt Clement <kurt.clement@flashmail.com>]

A question on Cerium Oxide preparation for polishing.  I have been 
polishing a 6" f7.5 for 5+ hours and am using Cerex 1670 mixed 1tsp in 4oz 
of water with 2 drops of dish detergent.  The mirror looks good visually , 
there are no visible pits , but the laser beam from a pointer is quite 
visible on the face of the mirror.

I did an experiment and shook up the mix, let it settle for 30 seconds and 
carefully poured off all but  the last 1/4 of the amount.  I then used the 
decanted mix to polish with.  It did show improvementand started to get 
better.

My question is:  what is the proper technique to prepare the Cerex, how 
long should it be left to settle, and is it normal to have to do this?

Thanks,

Kurt
Nixa, MO



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