[ATM] Removing a chrome coating : Update

[Ken Hunter]

If the mirror has been scratched with abrasives to remove a stubborn coating, you'll probably have to fine grind, polish, and then refigure it. Might as well get busy and break out the fine grinding abrasives and get to work.
   
  Ken Hunter
  

Guntram Lampert <glampert at aon.at> wrote:
  Hi, All.

I was pleasantly surprised by the many suggestions how to get rid of a 
stubborn coating layer.

I chose to follow David Weinshenkers advice and checked out the protosar 
website. Got the hydrochloric acid and the glycerin.

Since three days, the mirror is soaking in this solution outside. 
Outside because I do not want to inhale the fumes of the hydrochlric 
acid, and I don´t have acces to a tight vessel. Outside temperature is 
about the freezing point.

The coating is gone now on about 20% of the mirror area. The solution 
has dissolved the layer only where it was already scratched from 
previous attempts with abrasives.

I´ll keep you informed...

Best,

Guntram Lampert
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