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......I was chatting with a friend and our conversation migrated over to PC board etching. PC board etching has been around for awhile (I’ve etched boards well over 20 years ago) and widely practiced by electronics hobbyists. I then did some research and found examples of people using modern day etching chemicals (muriatic acid) to etch aluminum. That’s how I was going to do it… ...I printed a sheet of my images onto the slick backing using a laser printer set to print on “overhead” sheets...... I cut out an image and placed it over the badge (toner side towards the badge) and then taped it (using painters tape) on the back......The idea is to heat up the aluminum so the toner will dislodge from the paper and adhere to the aluminum......The basic ingredients you’ll need are 31% muriatic acid (hydrochloric acid), 3% hydrogen peroxide and baking soda (to neutralize the acid when done). Protective gear... You’ll also need a measuring cup and bowl for the etchant...