i just got rats about 3weeks ago and the past few days they have gotten black hair around there nose.they are fancy rats btw.is the black spot ok or is something wrong.

Are they black or a different color. If they are black or have black on them, they could have been young and are now getting some darker adult fur, so it looks like there is more black around their noses.

If they are a light color, it could just be dirt from sniffing. Rats like to stick their nose in a lot of things to sniff around, so they could have gotten a bit dirty from it.

Whatever it is, it doesn't sound like a problem.

a pic would help lol

Not knowing their original color I can only guess. I'll take a stab and assume they were originally either a creme or white color and their noses started getting smudgy gradually? If so congratulations! You've likely got a Himalayan rat or even a Siamese rat, though a Siamese rat is darker and usually has his points at a much earlier age.

Do they look something like this?
Himalayan: http://www.fancy-rats.co.uk/information/…

If not, what are their original color/markings/eye color?

And just for sharsies, the term 'fancy' rat refers to any domesticated rat, not a specific type or color of pet rat. Wild rats that were domesticated 150 odd years ago were done so by hobby rat fanciers. Over the years, the domesticated rats became known as 'fancy' rats because they were kept by these rat 'fanciers'. The pet industry now takes domesticated rats and bred them both to sell to reptile owners for food, and to sell them as pets. They breed a litter, and then separate the pretty pups into one tank and the plainer looking pups in the other tank. The plain fancy rats are called 'feeder' rats, and the colorful fancy rats they call 'fancy' rats. This way they can get away with charging 3 times the amount for the pretty ones. In reality, all calling them 'fancy' properly does is indicate that they are from 'domesticated' stock as opposed to 'wild' stock.

I share this to say, a so called feeder rat can have the same coloring (or breeding) as your pet rats, so the 'fancy' application doesn't help figure out the mystery of their color change. :)