This page was called gunbluingkit.html because it was the original kit. It was and is the smallest one, with the Quart Kit perhaps the most popular. It get's you interested in the concept if you can keep in mind while it says "rugged" it means you can get a "rugged" strong like 265 degree Hot nitrate bluing. It's not a lie, like you would think based on the name.
3 Bottle 4 oz Gun Bluing Kit
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The original but less popular than the 4 bottle versions.