an interesting subject and one we have done a fair bit of experimenting on in my shop. The final finish is a result of: the level of polish, the strength of the acid solution, time exposed to it, temperature, and humidity. Changing any of these factors will result in a slightly different finishes. I have stopped using a sweat box and just close the door to my bluing room room and bring my tank up to boil for a few minutes which brings both temp and humidity up. I have gone to doing lots of very short passes usually, but it will vary if I'm going for a more satin look. I rarely polish beyond 400 grit and always use a fine wire wheel before I rust my first pass. After that I hand card with degreased 0000 steel wool. Lots of ways to get it done and we all seem to have or own way we settle on, kinda like stock finish.
Steve
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