Whats the definition of pure stock?

Morphometry only defines visable characteristics so you could have black bees that are in fact have a high % of Italian genetics even with Amm mitochondrial DNA the genetics could be mainly Italian or something else

From what I see is happening here is that the black bee has been selected haphazardly on the basis of morphometry and some mt DNA studies. Also, there is no apparent breeding plan where tried and tested lines can be evaluated, just a concentration on the aspect of queen rearing from a range of basically untested queens followed by open mating, these being used again untested for the next and subsequent generations which any beekeeper reading a book can do. This is simply bad science !

Simple question - How far back can "pure" Amm black stock be traced and why are breeding records not publicly available for scrutiny ?