IF there is a "pure" race, then it would be some as yet undiscovered isolated little island out in the middle of the ocean somewhere. In fact, I think there was one such place that was featured as a human interest story in the aftermath of the tsunami a couple of years ago. The natives threw spears at a news crew helicopter that was covering the story.
Seems that you may have an oversimplified definition of race. I'm looking at it in its purest form, and no one, absolutely no one who is posting on this board, including you, is 100% anything.
So it follows that nobody is anything, right?
I think looking at something in its "purest form" is a pretty useless application for human relations and politics. Race is a perfectly sturdy classification along these lines, and it's proven far more durable than national boundaries or ideologies. The Soviet Union falls, and guess how people revert? To their ethnic groups! Racial and ethnic groups are like oil and water: you only keep them integrated through vigorous shaking. Let nature take its course, and they separate.
It also just defies common sense to running around saying things like "race does not exist." The **** it doesn't. People who live in the real world have no trouble with the concept of race. It's right there in front of your face. Big Brother has trained you well not to see it.
The denial of race today is kind of like communism once was: a politcally-motivated attempt to deny human reality. Communists set up an ideal that didn't work because human beings just don't operate as imagined or desired by those engineers. Race denial will fall, too.