To my knowledge Daguerreotypes were never commonly lacquered. In fact, I have never heard of a Daguerreotype being lacquered. Beginning in the early 1840s Daguerreotypes were gilded.I think thats why a clear laquer is applied over the image to protect it...
Perhaps you are thinking of collodion images?
In any case, there is a long discussion somewhere on APUG about how to increase the adherence of silver to glass. I never thought to etch the glass and will someday try it. I suspect that the matt surface of the glass would effect the surface of the silver and decrease reflectivity.


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