Shavalgen what you are saying is so intriguing, allowing a very simple way to "reconstitute" a Gold Phase (as it is termed here in the US). I would really like to get this to the bottom of this.
I'm looking at Holderread's Bulletin on Welsh Harlequin Ducks, he writes:
"If a Silver Harlequin is mated to a Khaki Campbell, all of the offspring will be colored like Dark or Khaki Campbells. Results other than these strongly suggest cross-bred stock.''
But you say "If you want to get the brown silver harlequin just add some khaki campbell blood."
Pehaps the discrepancy has to do with terms used for genotypes. Holderread terms the Gold phase to be MD/Md, lih/lih, d/d
he writes the Silver phase is MD/MD, lih/lih
Does this correspond to the genotypes you term Welsh Harlequin and Abacot Ranger color pattern as applied to Welsh Harlequins? (I say "as applied to Welsh Harlequins" because I am also looking at Mike and Chris Ashton's book Colour Breeding in Domestic Ducks and they distinguish the Abacot Ranger as a different breed from the WH. I have never heard of any AB in the US.)
Basically if we are using different genotypes for what we term the same breeds we will of course get different results. So that is why is ask for your confirmation on these genotypes in the above format.
I am very sorry for any discrepancies in terms, I pretty much have to communicate in the country in which I live. (I am looking for a reference link to show you the US standard for Welsh Harlequins, which is the "Silver".) I would like to see more "Gold" raised here, as far as I can tell there are only two breeders in this country that sell them. So that is why your statement is so intriguing to me. Please forgive my clumsy understanding of genetics, which is even more confused by international differences in definitions of terms and breed standards.