Just saw your pic Yep, you have a blue and a black as you already thought. The black bird's bib doesn't look too bad to me from this angle (not too blotchy) except for the fact that it continues right up to the chin which is not great. The black bird looks to have white flight feathers coming...
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That is a shame.
I guess the thing to decide is how serious you are about wanting to breed up birds that you can honestly call pure bred Swedish. If you just want pretty pets then carry on with the birds you have. If you want to own or sell or show birds that you can honestly call...
If you mate black to black you will only get black. No blue.
If the lady's Swedish ducks (and therefore perhaps yours) were not pure for a gene called Extended Black then you could get Rouen coloured offspring from Swedish to Swedish matings. Extended Black is dominant, so you only need one...