Hmmm...ok, one more question...the blue is a black diluter like BBS. so a black roo from blue lines does not have a copy of the blue gene. a blue roo would have one copy of the gene and a splash roo would have two copies.
if you put a normal black roo with a blue hen you would get 50% blue chicks and 50% would be black. if you put a blue roo with a blue hen you would still only get 50% blue chicks but 25% would be black and 25% would be splash (even more diluted than blue) now if you put a black roo with a splash hen or vice versa they would be 100% blue because they would all have only one copy of the gene...from the splash... but nothing from the black parent.
the blue is not a recessive gene...when there is only one copy then that is when you see the blue. that's why blue can never breed true.
What happens with splash to splash....100% splash?