I use citrus zest all the time! If this technique changes the flavor, texture, or aroma of my fruit, I say stick with the labels. I can peel off a label and still have the whole zest. That etching means I lost a good chunk of peel I'd use for candied citrus peel, not to mention making any sorbet served inside an orange just plain silly-looking.

Rawhide: Dr. Banzai is using a laser to vaporize a pineal tumor without damaging the parthogenital plate. A subcutaneous microphone will allow the patient to transmit verbal instructions to his own brain. Observer: Like, "raise my left arm"? Rawhide: Or "throw the harpoon." People are gonna come from all over. This boy's an Eskimo.