Siamese cats (I use that term lightly...Color point is the color pattern that any cat can have, Siamese is a breed of cat that is known for having the color point pattern) have the Himalayan gene which is a form of albinism. It's a recessive trait, so the cat needs to inherit two copies of it, one from each parent. It restricts pigment based on temperature. Pigment is restricted in warm areas and is shown in cooler areas of the cat. When meezers are born, they are all white because they've been toasty warm inside their mamma. As they grow older, they get darker where their body parts are cooler (face, ears, legs, tail). Often times they'll be darker in the winter than in the summer. After a surgery, if hair was shaved off, it might grow in a lighter/darker color than the rest of the hair until a full shed cycle has been completed. There is also an inherited factor in how dark the cat may get. Siamese breeders make an effort to breed cats that will stay uniformly creamy over their whole body with dark points. Some color point cats will be almost completely colored and just have darker points than the rest of their body.
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