>Watch the video at the 58 second mark ..
>Good old Don Bailey says "Put a light source behind it"
> THAT MEANS....
> Put a light source behind it..
Don't got u-tube...... is the flashlight's light source, the surface measuring bar, and his eye all lined up >>>>>>>>>>perfectly<<<<<<<<<< on the surfaces tested (since the surface is polished and reflects polerized light and 99.9% of the minerals are either transparent or translucent to light as a result of polishing).
Archae Solenhofen (email@example.com)Jon