Self brown/chocolate morphed almost completely to a self black?

Little Piglets

Junior Guinea Pig
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One of my pups (little over 3 months old) started life as a chocolate colored short hair. About 6 weeks ago, I noticed some black markings started to appear. First, she started getting symmetrical rings around her eyes with striping on the upper nose, tops of her 4 paws went black (I know I've seen white gp with a less dramatic black frosting at points).

Started thinking, wow that's really neat. Then, the black kept taking over her fur. While she still has some brown areas like her underbelly, everything else went dark. What's really interesting, is ONLY the tips of the hairs actually seem to be black, but due to how dense the fur is, it gives the illusion of being as solid color.

Is there a name for that?
 
Their coat colours can change as they grow older, I do have an agouti as well
 
Had no idea that would be considered agouti. Thought agouti needed to be several different colors per strand. Her mom has some traditional agouti patches, similar in color to a wild rabbit, but the dad is a solid self-black. Looks like she went super mutant and got a little of both :)

Yeah, she's full-on black at a glance now. But if you push her fur aside or against the grain, the actual hair from the root to where it changes, roughly 95%, is actually a lighter chocolate/grey-like color, then the last 5% is solid black. Like she had the tips of her hair dipped.

Maybe I'll snag a couple pics for reference if anyone is curious, and I have a side by side of her with dad at I think a couple weeks, to show how drastic of a change has occurred.
 
In a weird twist, my other sow pup (she's white and black; a sister) who started out as white and black, is also going lighter on the black segments, which I thought was my imagination at first. Upon closer examinations, her black sections are ending up just like the chocolate to black one! Very strange.

So one started a solid chocolate but now has black tips, and is actually agouti, while other one started with solid black hairs and morphed in the lighter lower sections- with black tips! Very cool to see two entirely different piggy hairs end up virtually identical, despite arriving that way completely opposite.
 
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