Yes you can find phosphoric acid (don't know about the brand name the stuff I used just says phosphoric acid on it) at my local home depot it is in the paint dept. but also the cleaning isle...
MOst of the time I will use ferric and distilled water and sometimes muriatic sometimes I will do muriatic first to start the etch and then ferric to color the one alloy wich works really good on stainless Muriatinc will be in the paint dept. at home depot its in a gal bottle the bottle it self is white with a blue and green label
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