Re: [ATM] no to beeswax!

[Bill Marriott <bmarriott@pacbell.net>]

Hello,

A couple of comments here.  First off, black rouge is not something I 
would reccomend using to generate a polished surface off a ground 
mirror.   Black rouge either does not work at all, or just as a final 
final figureing compound, depending on who you talk to, and all will 
say, what a MESS it will make.

A better appraoch would be to find out why pitch and cerium did not work 
for you.  After an hour of work, you should have a start of a polished 
surfce, and in another 6-8 hours mostly done. If you are getting 
scratches, its becase of contamination of your pitch or polishing 
compound. If just haze, then you have a way to go, and there might even 
be pitting from a previous grit that was not removed by smaller grit 
size aluminum oxide.

Nothing beats Gugloz Pitch #64 and CeO for generating a great mirror 
surface.(IMO)  Let us know more....

Bill Marriott
VA Optical Labs


Jon Bales wrote:

> Here's a miserable failure story. 
> I'm polishing an 8" f5.7 mirror.  Using pitch and CeO, I couldn't get a surface that didn't show some light scattering at the surface using a cheap red laser.  (there were comments about lasers previously). Otherwise the polish looked good.  Having learned that rouge gives a better polish, I ordered some, and coated the tool with beeswax before using the black rouge.  That's the failure story.  Beeswax leaves brushmarks that will not flatten out even after warming the tool and warm pressing.  The pitch will soften under the wax, and give,  before the beeswax flattens out.  I think I've learned not to use beeswax.  Now I see that Tex calls beeswax a rigid material which doesn't deform, and leaves defects.
> 
> Now a question.  What is the best substrate to use with black rouge?  There are several pitch varieties offered.
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