You will most likely get more blacks. But generally it's a crap shoot. As other people here describe it, White in Silkies is an "off-switch". If a chicken is homozygous recessive white (meaning it has two copies of the gene), then it will be white regardless of what other colors it may be carrying. And because it is white, you don't know what other colors it may be carrying until you do a test crossing with another color. I hope that helped some.