You may want to stop at this point removing heavy black pitting can be made better by using brass dental style picks along with oil.It is time consuming. To correctly acid etch a full barrell you need to submerge the whole barrel. You can get various other results using a quick ferricc chloride etch. If you are feeling brave you can do it with a full hydracloric bath but I would suggest you may want a chemist or a similar type of person with you to do it. It is a little dicey
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