Lar
I like to use the punnet square approach to describe the 66% het number.
In a het to het albino breeding the punnet square will define four equal size groups of babies...
aa - These babies will get two albino genes, one from mom and one from dad.
aA - These babies will get an albino gene from mom and a normal gene from dad.
Aa - These babies will get a normal gene from mom and an albino gene from dad.
AA - These babies will get two normal genes, one from mom and one from dad.
The homozygous albino group are obvious (duh) and easily seperated from the overall group Leaving 3 groups left of which 2 out of 3 (2/3) groups are het. Since you can't visually tell them apart all three groups get lumped together and 2/3 probability on any one individual.
I know - you already understand it, just talking you through my thought process and explanation I use to educate those that do not already understand it.
And of course the always important disclaimer - individual litters will vary.
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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC and still very fiesty)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
26.49 BRB
20.21 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 

