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I will be possible(but most probably difficult)to deactive them but only if they are not all homozygous for those particular genes. You have to have at least one bird with a different(=red-free)allele(it applies to all those involved red genes).

Yes indeed, just before it was rather simple with only 2 phaeomelanin to count with.
I am very grateful to you all that you take so much patience and time to reveal and explain all this to us.

When we have knowledge on how to distinguish the difference between sex-linked red, autosomale red and salmon red we can act to deactive them in the way you discribe Wieslaw but what about those red-pigment producing genes we do not know, so we can not determine them, how shall we know if they are Dominant/recessive, homozygous/heterozygous to can take action against them ?

Maybe we dramatize a little, maybe these "other" producing red-pigment genes are so exceptional that we hardly ever will encounter them in our private poultries !

It would help to make the columbian homozygous.

Yes indeed BUT I talk about Silkies ! I have had roosters and hens with homozygoos Columbian-like restrictors, the result was nomore black in the hackles (so it's probably Db at work).
For that reason I went for black-pigment intensifier(s) (Ml & cha) which give in my eyes good results for the contrast BUT they are on "eb" so grayish undercolor (which get through in sight) and "eWh" is not an option for "Silvers" !
Probably a vicious circle.

Coming back to your original question: I have observed some hens that might be eb and have something that looks like a wing triangle.

Here is the first video showing the chicks looking like eb to my eyes:
http://www.youtube.com/watch?v=HUS6BE7KKU8

Try to observe closely the following video. You should notice some very dark brown hens(some close to black) and some of them show a very distinct wing triangle.

http://www.youtube.com/watch?v=gO_jrJgjWMA&feature=related

It is also showing that eb can be present in game fowl, contrary to what I have previously read in some old threads.

PS. For those of you who are fans of ROYAL RUMBLE, something for you :

http://www.youtube.com/watch?v=_vk7aQYyXOg&feature=related

It is difficult for me to say anything on fighters, I have zero experience with them.
But I found something particular in an Italian breed :

I doubt this hen is on eb. In my opinion it would not melanize that much in presence of Db, especially on the breast.

When not eb what e-allel would you say ?



And this ones :

The dark ones resemble the german bergische Kräher, color is called "gedoppelt". I think heavy melanized birchen with Db and Ml.