[ATM] Removing a chrome(?) coating layer
sgharadur at gmail.com
Thu Dec 27 14:11:44 JST 2007
I want to build a reflection telescope. But i am unaware of making lens from
a thick glass plate. What are the procedures to be followed? can you people
help me in this regard?
On 12/22/07, Guntram Lampert <glampert at aon.at> wrote:
> Hi all,
> A few days ago, I tried to remove a mirror coating by polishing it off
> since I intended to do some figuring anyway.
> A first layer came off pretty quickly, followed by a second one that
> left a dark grey residue on the lap. No doubt this was the aluminium.
> But now I am left with a metallic layer that I suspect is chromium. I
> once read that it is used as a first layer to improve the adherence of
> the aluminium.
> Now, I can´t get rid of this first layer. Treating it with diluted
> hydrochloric acid, no result. Added ferrous chloride solution, nothing.
> Rubbed it with "soft" abrasives, remains there.
> What to do?
> Thanks for suggestions,
> Guntram Lampert
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