I used a paper towel dampened with soapy water. (Just water dries out too fast.)
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I’ll have to look when I get back down there. I was thinking I etched the silver off the back, but you’re right about the reflection; maybe my plan was to try the back the NEXT time, and my memory is playing tricks on me…
Dang. It’s one thing when you reach adulthood and start turning into your parents…now I’m finding myself turning into my grandparents!!! 
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Here’s a rear engrave with a glass mirror:
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Hmm… ok that’s a good idea. I’ve made a disaster of one… lol. Need to try another one.
Tell me about it… I have 3 crazy little monkeys on my case while working and my husbands a 4th one 
sorry that’s just my life story.
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To protect the mirror, I used the protective adhesive from one of my proofgrade pieces of acrylic. Just pealed it off and stuck it on the mirror. I wet my fingers and rubbed it on the adhesive–only because I saw a few samples on the forum that mentioned using a wet paper towel. So, the adhesive was a little damp.
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Great picture. 
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I’m currently trying to do my first Mirror Engraving, thank you for sharing your experience hopefully it helps mine be successful.
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But not your glowforge!
LOL! Very nice! I LOVE the dog, too! 
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Best of luck! I’m sure you will do well. I’d love to see the finished product.
Very nice.
Beautiful!!!
That looks so cool. I never thought of engraving the front of a mirror. I have always reversed my image, or writing and engraved on the back.
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Love it!!! such and adorable guy.
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