Mine is a peculiar situation, being that I have had three MBK's (currently own my third one). I'll try to keep this brief...
The first MBK I got was back a little over a year ago. She was practically a hatchling when I got her from a reptile expo in New Hampshire - and she was flawless: absolutely nothing but black everywhere (no spots, flecks, brown, or ANYTHING but black!). She fed without any problems, never attempted to strike, and never musked.
Her name was Lilli -

Unfortunately, she managed to escape from her cage one day - and I never found her. To this day I very much regret not taking greater security measures with her.
I eventually got another young female MBK - but this one I got from a distributor online. It was the first time I ever bought an animal online, and I knew I was taking a chance. I shouldn't have. It turned out that what I got was a very, very dark brown snake that had a faint california kingsnake pattern on it. It paled in comparison to Lilli, though it did have a good attitude and appetite.
Here's the second one I got (you can't tell from this photo just how 'brown' she was):

So, I gave her to someone who was ok with her 'non-blackness', then I set out to get what I wanted in the first place (a BLACK mexican black kingsnake). Once again I took a chance and ordered another young MBK from someone online (a different guy this time) - and again, I'm beginning to think now that I shouldn't have. The MBK I received is something of a problematic consideration for me. Here's why: 1) the girl has a nasty attitude (striking and musking every time I go to get her out of her cage), and 2) she's got spots! Yes, spots, not just the typical two white ones under the chin, but big white spots on her belly too. And on top of that, I can see in her a very faint pattern of what appears to be a splendida pattern. Granted, it's very very faint, but compared to Lilli this is quite a flaw.
Here's the one I have now (sorry I don't have a pic available to show her pattern or belly spots):

Now, I know that young snakes can be nippy, and that MBK's sometimes start out spotted and grow into solid black color, but Lilli had a great disposition and was all black from day one. Is it really asking so much to find a decent MBK? Or did I just get lucky when I got Lilli in the first place?
Sorry for the long post - that just been my experience so far,
- Mark
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>>Thanks for the replies from 1/16. Our experience is mostly similar. However, interesting contradictions exist, since we're dealing with individuals.
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>>My 2003 male has NEVER bitten, musked nor hissed. Has always handled very well.
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>>He usually eats well, but after November he began ignoring food at times. He has not eaten in 3-4 weeks now, is much less hungry than he was during spring & summer.
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>>Usually, he sheds all in one piece, but the last shed was a problem. Days after his eyes clouded and then cleared, no shed. I kept looking, but I only see some signs of post-shed dry scales on his upper area. No skin was found; it looks like he mostly skipped the last shed. This is the first such time.
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>>1. How often do you have incomplete or absent sheds?
>>2. Is the belly of yours silver-blue? Most literature states that Mexican Blacks have all black bellies, and that Baja Cape Kings (Nitidas) have blue bellies. Mine has a blue belly, is that true of yours, too?
>>3. Do Nitidas always have some type of light pattern, or can they ever mimic Nigritas??