Two packs of Brand new Birchwood Casey Perma Blue Liquid Gun Blue in retail packaging. You’ll receive 2 (two) 3oz bottles of Parma Blue in each purchase. Birchwood Casey Perma Blue Liquid Gun Blue is the best way to touch up scratches and worn spots or even completely reblue most guns. It will give a non-streaky, even blue-black finish to steel (except stainless steel). Perma Blue will not blue stainless steel, aluminum or non-ferrous metals.