Also, we have a friend with a white silkie hen. Thanks for any help. Backyard flock you can breed anything you desire,but the genetic color will probably not be recognized. Typically we only breed buff to buff.
Blues come out of blacks that have been bred to blues,whites,splash,or blues.
Either borrow your friends white hen to put with a blue roo or lend your blue roo out. Buff is one of the most difficult colors to breed. Unless you want to hatch a lot of chicks even backcrossing to your buff cocks will take many generations of backcrossing to recover the clean buff color. You will also be segregating at Sex-linked silver and gold and at the E locus, and who knows how many other genes are involved. One of the reasons that black feathers keep cropping up in Buff lines is that there are so many dominant genes involved in the buff feather color.