When I say “dark golden retriever,” this is what I mean:
We may call this dog “red.” As you can tell from the name in the JPG file. However, dogs of this color were always within the accepted range of golden retriever color.
Just not in the UK or the FCI.
And here’s another:
Djanick Michaud at Zomarick golden retrievers suggested that I include the color range for the breed. He has a very good color chart on his website.
And here it is with actual dogs for visualization purposes: