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I mean for instance the moorkop owlbeard. It shows that the blue is much darker on the melanized head than on the tail.

Ah ok. Do I see it correct, is the "moorkop" epistatic ?
I wonder, If I cross such a hen (Blue Silver Partridge with moorkop) with a similar rooster could this result in as good as white (Silver Splash) Silkie with a moorkop ?

Does anyone have an idea what genotype have the (Nederlandse Uilebaard Moorkop) "white moorhead owlbeard" ?
Can this be double doses Blue (Bl/Bl) with cha/cha ?

Next to "black" crest they are also with "gray" crest and with "light" crest on these "Blue Silver Partridge"

When the "black" crest should be caused by the charcoal-gene "cha/cha" than the "gray" crest should be "Cha+/cha" and the "light" crest should be "Cha+/Cha+" .
But than the charcoal-gene could not be a recessive gene but must be a Dominant gene => Black crest "Cha/Cha", gray crest "Cha/cha+ and light crest cha+/cha+, no ?

recently saw some hatch down photos of chicks which for all money I would have said Co restriction/involment, eb and but they feathered out fully black, Ml was involved along with other pheom enhancers

Charcoal:
There may be more alleles at this locus.
In my findings it behaves as an incomplete recessive. One dose has little effect on males, but is often noticable on females (back of the neck)
So one could defend it as a dominant gene too I guess, especially in a permitting genotype (e^b etc...)
In scientific literature it is mentioned as both dominant and recessive, but they may refer to different alleles.

The moorkop is a lightly spangled phenotype (getoept).
Columbian-like restrictors and melanizers in play.

I read already about possible more alleles on the cha-locus but with your extra clarifications it start to make more sence to me.

For the "white moorhead owlbeard" what e-allel it should have, I suppose "eb" even the spangled-tails are "ER" DbPgMl !

I not breed Hamburgs or Owlbeard but Silkies and these "Blue Silver Partridges" should be "eb" with charcoal. I have it on a young rooster and on a young hen in pure (intending as blackhead).


You can see the Columbian-like restrictors have much more effect on the rooster than on the hen.


When these 2 are crossed I should become +-25% Splash (with all the Silver and Columbian restrictors it should be as good as "white") with keeping the (intense) blackhead !

Is my reasoning correct ?

I got the blackhead effect with heterozygous blues. I don't think that splash would improve the contrast.

I could find a little webpage on this subject (it's in Dutch)
click
Here is mentioned blue undercolor and crossings with white black-crested Polands.

What is the genetic-code for these white black-crested Polands ?

http://www.polishbreedersclub.com/apps/photos/photo?photoid=118503470

A strange explanation about crossing a Black white-crested Poland Rooster to 2 white black-crested unknown breed hens.

The F1 offspring are Blue (so the hens should be Splash) but they also produced Black offspring !!!