although its an acid....what you get sold is in diluted form, and like with ANY chemical of any kind...you certainly don't want to put it in your body. it certainly can/will irritate your eyes, that's for sure and like with ANY chemicals should be used in well ventilated spaces.
granted, evapo-rust is TOTALLY biodegradable, and doesn't/shouldn't cause any problems in your body. it looks to be what you need for your application.
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