AR99 Glass - which side?

[topcat]

A customer i did some framing for with AR99 glass, decided to dismantle their frames at home and in doing so took out the glass and now i'm at a loss as to which side is which on the pieces that do not have printed text on. Does anyone have a method for telling one side from the other? Thanks.

[Teresa]

Scratch the corner with a blade. the coating scratches off.

[iantheframer]

You can also look at the edges, cutting wheels leave a sawtooth type mark, this will be the side that was scored, and therefore the uncoated side

[Steve N]

The side that has the coating on, faces the art, so it is protected when customer (if they ever do) cleans the picture when it hung

[Rainbow]

^ It makes sense when you think about it, but thank you, that was the question I was going to ask!

[topcat]

Thanks folks.