When two het albinos are breed, each egg will have a 25% chance of being an actual albino. With four eggs you could end up with all albinos, no albinos, or a mix. That is up to the ball python gods. When two actual albinos are breed together all of the offspring will be albinos. You never really know what you are actually going to get when two ball pythons are breed. You only know the odds (%) of producing something.
Maybe this will help more.
also, check out this site: http://www.ballpython.ca/genetics.html
mark has a really cool genetics presention.... click on recessive at the bottom of the page and it will show you how albinos work.
I hope that helps a bit, a visual always helps.