Nina - without a picture its hard because no one can see the yellow that you are talking about... pet shop is known for that, they sell animals and pets that they don't know a lot about... and why ? they don't care - for them the only important thing is to sell !
and
Karl - thats not right - I don't agree with you.
She wanted a cornsnake, but this is - when you look at the pictures not a corn, and I'm not alone with this thinking BUT a animal is a animal, and a pet is a pet and no matter what this beauty is, she deserve to stay and love by you Nina...
Stay here in this forum - rat's are in the same family like corn's