Every once in a while my brass comes out dull. Its clean but lacks the jewelry like shine that we associate with wet tumbling. I chalked it up to a couple of things. Once I added an extra tiny bit of LemiShine because the brass had more than the normal amount of stain. Another time I had to leave them in the tumbler for a little while. Because of that I tumbled them for another half hour. I just now noticed that both batches had a few nickel cases that snuck into the mix. My question is, will nickel cases cause this?
I'm not really a rookie at this. I have a date written on my tumbler motor of May 2013 when I bought it so I've been wet tumbling at least that long. I've tumbled many thousands of cases since then, with mostly excellent results. I'm just trying to learn whats going on when I have the rare occasion that the results are not what is expected. Thanks