Re: ATM removing tarnish

[Malcolm Macdonald <toliman@wave.co.nz>]

At 10:18 PM 27/08/01 +1000, you wrote:
>
>BUGGER!!
>
>It looks like my hopes are dashed. I wonder if Malcom in NZ gets the same 
>results.
>
>Malcom??
>
>Cheers,
>
>Bill
>

Sorry Bill, The 20" that I am trying to figure at present is taking all my
time, and more, and with a 4.5m ROC I haven't space to move in my shed. So
my old mirrors will have to stay tarnished for a while yet.

Having said that, I can say that I had exactly the same results as you when
I just rinsed a tarnished mirror recently.

I took my scope to a group viewing and set up near a thermal vent (we have
lots of them here) that was spewing  Hydrogen Sulfide gas. Next morning the
mirror was black. As it was dirty anyway I put it in a basin of warm water
with a squirt of detergent and swished it around a bit. When I lifted it
out I noticed the water was all sparkly. Half the silver had washed off
with the water, So don't be too quick to blame the Alu & Soda. It may have
been going to happen anyway.





>
>>From: Richard Evans <Richard.Evans@flinders.edu.au>
>>Reply-To: Richard Evans <Richard.Evans@flinders.edu.au>
>>To: atm@shore.net
>>Subject: Re: ATM removing tarnish
>>Date: Mon, 27 Aug 2001 14:31:48 +0930
>>
>>
>>Hi Bill, well I tried the process and it removes the tarnish nicely, but!
>>it appears to be a good way to remove the ability of the silver to adhere
>>to the glass! Oh well, not sure why, but when I gently washed off the
>>yellow flakes and gunk, off went the coating, (and on went another one
>>shortly afterwards)
>>cheers
>>
>>Richard Evans
>>Adelaide
>>Aus

Malcolm Macdonald.
Rotorua, New Zealand.

Experience is something you get after you need it.