I've been brining a roast for 13 days for dried beef. About 3 lbs. I was rinsing it tonight to let it dry in the fridge and was trimming a little. I noticed that some of it looked like the dull gray color. I took this picture. Deep inside it's pink, but the outside is this color. Does this look right to you? If not, what could have went wrong? I used a cure mix from a local vendor. I'm not sure I want to smoke this, but I'm not sure what may have happened, either. Ideas?