From: "Dwight K. Elvey" 
To: atm{at}shore.net
Reply-To: "Dwight K. Elvey" 



>From: "steve desfosses" 
>
>hi everyone,
>i have done a foucault test to see if the chrome base of this coating
>affected the figure. foucault readings give me a 1/16 wavelength , same as
>before coating. so figure didn't change. now for the spots i have counted 30
>! none are bigger than 1mm across.
>when i opened the package the first time i tought it was some kind of dust
>and tried to wipe it out with facial tissue(wiping very lightly over the
>surface) but this create fine scratches. probably caused by particles of
>aluminum catched by the facial tissue (i have done this before on my other
>mirror and never did a single scratch. because of this i didn't tried to

 Freshly coated mirrors are more easily scratched than
mirror that have the oxide coating thickend over time. There is also some
chemical change in the type of oxide. Dwight

>clean the mirror more to see if there was pits under these spots. instead ,
>i was able to find a spot that has lost its aluminum bubble and light it up
>from behind the mirror. but what i saw was not a point of light but
>hundreds. lighting up the mirror from behind was like looking in the night
>sky in a very dark site.what is causing this? it is surely not a lack of
>polishing , this mirror recieved around 30 hours of polishing....if somebody
>can give me an answer on this,  i would be very pleased !
>thanks
>steve desfosses
>
>
>
>

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