I dont believe any of Rez's IBL lines involve any "selfed" seed stock.
He uses a method known as "cubing" in which you cross the original clone to a male with mostly recessive traits, then back-cross the F1 generation to the original clone repeatedly.
The first back cross(BX1) will have 75% of the original clones genetic material, the second back cross(BX2) will be 88%, BX3 94% and so on. Eventually you get to 99%+ and at that point it is considered an "Internal Blood Line".
This is correct!
At least the first part is, IBL does stand for inbred line though (I'm 99.9% sure).
Rez def didn't use silver on his sour line, his chem line, or any of the lines I can think of.
In fact I think that's one of the biggest reasons he despises those other breeders. ALthought those other breeders are producing stellar gear