Aww, I hope he/she gets adopted fast.
Almost all solid color cats have visible ghost patterns (especially reds) when they are kittens.
They usually fade when they grow. In purebreds the ghost markings are usually a bit harder to see as breeders are trying to get a good even color and are intentionally trying to get rid of the markings. I think only Egyptian Maus are bred to have strong ghost markings (in black smokes).
One of my cats has a solid black sister who clearly had spots in her black fur.
Here is a link to a picture of her where the markings are showing a bit, the pic is too large so I don't post it directly here: click
. (My kitty is the one who doesn't quite fit in