Re: ATM Question about grinding

["Bob May" <bobmay@nethere.com>]

The glass surface should have a smooth frosty appearance.  In the eyeloupe,
you will probably see the purple and blue speckles amongst the other
speckles and they should be nicely spread about.  I tend to use a distant
light source and reflect the angle of the light until it turns an orange
color and then traverse it across the surface to see the amount of
reflection of the surface.  Changes in color will indicate the fineness of
the grind with oranger being coarser.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net