Re: [ATM] A very rough surface mirror

[Jeff Rowe <jeffrowe@austin.rr.com>]

Guy;
I think you're right. Today I'll pour some Drano ( aka caustic 
soda/sodium hydroxide) with a bit of water, on some window pane that has 
a bit of wax as a resist, drawn on it.  My hunch is that I'll be able to 
feel the etch, using finger nail metrology in short order. Some may say 
this is an unreasonable test. When dealing with nm changes, a little 
goes a long way. I will report back.

Best
Jeff Rowe


Guy Brandenburg wrote:

>What Dale says here is usually right. However, in some cases, there is lots and lots of grack on the mirror which will grind into the surface. A good cleaning with water and detergent and your bare fingers (so you can feel the little particles of grack with your fingertips), followed by pouring on a mixture of hydrochloric (aka muriatic) acid and a little Copper II sulfate crystals dissolved therein, will remove the coating with great speed and without further etching the surface, which will be the result if you use strong alkaline substances, in my experience, and in the experience of others who have reported to me on this list.
>Guy
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