Yes, it's called "carding" the bluing and is done on production hot bluing to remove the "fuzz". Just use very fine steel wool or a soft wire brush and reapply as many coats of cold blue as you want. Steel wool can take all the bluing off if you apply too much pressure for too long. I use paper towels. TIP - after you wipe the first coat on and card off the fuzz apply subsequent coat with a paper towel with a very small amount of cold blue (1 or 2 drops) and rub it in like you're waxing your car. The fibers in the paper towel act like a buffing wheel and polish the finish. Rub it hard and fast. Another helpful tip is to use a hair dryer to heat up the steel before applying the first coat. Just enough that you can barely handle it. While cold blue can be made to look really good it won't wear anywhere near as well as hot blue and offers no protection from rust. But it's great for touching up small areas.
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