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Re coating of the Shane three meter telescope mirror
in February, 2016.


Information on mirror de-coating:

We have been recommended to a mixture of

90 percent Phosphoric Acid
  5 percent HCl
  5 percent H2SO4 

For mirror de-coating. 

Also recommended Jasco Metal Enchant from Ace Hardware.

From Paul O.

More info


De-coating at Aluminum Coating
We use a multi step process,
cleaning, first with water followed by paint thinner and finally lacquer thinner.
Then a soak for two days with the mirror surface submerged in printed circuit board etchant.
Then soak overnight in diluted swimming pool acid.
All mirrors get a final cleaning with pure methanol before coating.

While rubbing with a soft abrasive such as talc might help remove
a stubborn coating we do not do that process here.
Polishing and figuring is left to other vendors.

We recommend avoiding the use of Sodium Hydroxide, NaOH and
strong, concentrated acids.



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Page last edited May 9, 2013