I'm Amy.... 2011 marks my 10th year raising silkies. I've been concentrating on the the blacks since 2006 at least. There are a few of the old timers still have some awesome ones out there..... Eddie Travers, Premier, Myron Turk just to name a few. I don't claim to be an expert on them, but I do raise quite a few good ones.
Blacks pose just as much of a challenge to raise as any other color. Build the barn and then paint it... Get the body type down and then worry about perfecting the color. I am still battling issues with looseness of wings, comb size, horns on comb, 6th claws, etc. Just like any other colors, you breed alot and cull hard for those first. Then you deal with the color too. Some of those chicks first start getting off color in the hackles at 3-5 months, some at 10-12 months, and some are after a few years. It means alot of time in the growout pens before you decide on them. Its very common to see the black not extending down to the feather base. In some lines, you see the partial white toes and nails. Direct sunlight can bleach out the feathering, so conditioning also plays a role.
Feel free to click on the website link and it will take you to my photobucket page. I have thousands of pics grouped under breeding stock and pics of young stock from each year. In 2006 I got rid of all my old stock and shipped alot of birds up here from Bobbi Porto from FL. This was almost after she combined her flock with Alan Stanford and was getting rid of the extras. It was also before she started crossing to the lavendars so the ones I got were all still the pure blacks. Fall of 2008 I got 4 young pullets from Premier Silkies and crossed them in and kept back the best 17 pullets. Fall of 2009 I got an older black cockerel from Premier's show string and he died on me that winter. Spring of 2010 I got another cockerel from Premier. I've been crossing them back on those girls and will eventually keep just some of the young stock from this and next year. I keep BLACK ONLY pens and keep specific records on parents of each bird. Some of the other BYC'ers that have gotten blacks from me and have posted pics are ultasol, silkieluver_07, joe17, cityslickers, tinychicks, etc.
I think a mistake alot of people make with them is using them only as project birds for other color projects. Blacks are extremely beautiful in their own right. There are a few old lines of black only. When people started crossing them on lavendars especially (and now the paints), I feel that are just using them to get better type on those 'mutts' and forget about keeping an all black pen to maintain the line they already had. Well pretty soon you end up with all these sub-par 'split to whatever' birds. Some of these splits are getting better over time, but far and few between.
Ok the black color itself....
There are several types of blacks in silkies, all of which are determined by the E gene.
The alleles (variations) in order of dominance are:
1. E (extended black) - applies to most of black birds; needs least amount of help from other genes/melanizers to make a black bird
2. E^R (birchen) - needs help from black extenders to make a black bird; creates a bird with pheomelanin on the head, hackles, shoulder, saddle and breast feathers; birchen-based birds do not have pheomelanin on their secondaries (wing triangle)
3. E^Wh (wheaten) - dominance can vary and behave as a recessive under certain circumstances
4. e+ (wild-type)
5. e^b (brown or partridge)
You also have to consider that all chickens have a silver/gold gene too. Males have two, females one. They can be either silver (S/S or S/-) or gold (s/s or s/-), or males can be golden (S/s). This shows for some varieties (partridge, buff, grey) but not others (white, black, blue, splash). Incorrect combinations of other genes can cause silver or gold to show on the patterns where silver/gold should not be apparent.
Here is a great link to some books specifically on silkie color genetics.....
http://www.chickencolours.com/