Wayne, acutally, the "points" are the result of a gene that allows darker pigment to form in colder areas, hence the ears, face, feet and tail being darker, as they tend to be colder parts of the body. It is not exclusive to cats, either. In fact, the Himalayan cat was so named because their patterns resembled rabbits and goats living in the Himalayan mountains. The fact that temperature was a factor was proved when a himalayan rabbit was fitted with a cold pack on its back when it was a kit - when it was removed the rabbit had a dark patch. We had a Siamese that spent her kittenhood in Denver and was very dark all over, and another who spent her kittenhood in San Antonio, whose body color was nearly white.

Other colorpoint facts you may find interesting:

It is generally thought that the Siamese is the genetic origin of all pointed cats, so it would only be natural that pointed cats share other traits with a Siamese.

All eye colors are linked to coat pattern, so all colorpoint cats will have blue eyes.

The colorpoint gene is incompletely dominant, which means a cross between an incomplete dominant and a recessive will result in a mix - which is how tortie points, lynx points and showshoes have come into being. This is also why so many, many cats who are pointed show some characteristic that they are not purebred Siamese - such as white toes.

Colorpoints are born white, and start developing their colors after about a week.

But, anyway, the only way to know that your cats, or any cats, are purebred, is to have their papers. But if they have no tabby markings or white areas anywhere on their coats, they are probably so genetically close to being Siamese that they are, in essence, Siamese!

Are we ever going to get to see photies of all your sweeties?