Boric acid is also used as an eye-wash ingredient. As a anti-roach material is is commonly used in kitchens.
Don't eat it, try not to breath it's fumes for long periods---just like you should not be breathing your forge fumes for long periods no matter what the fuel is, (save for an induction forge), and you should be fine. Remember what's in your slack tub (water) has killed millions of people and so is a highly dangereous substance!
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Thomas
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