Correct. And both of those genes are really more modifying genes rather than color genes. Both types of blue genes dilute black feathering, changing it from black to shades of grey. These 'blue' dilute genes can be applied to just about any 'pattern', from barring, to solid black, or even to partridge-type patterns.
Think of it this way. There are only two colors for chickens, silver or red/gold. Black is the base color for pattering. Pattern genes control how much and where black can express. All other colors, like white, blue, splash, and self blue, are the result of modifier genes affecting pattern color.Ok, so I can accept that blue means gray and not to think of the paint box with chickens. And yes, I've heard of blue roan for horses and blue heelers so it much be an animal thing
Now I have to go read color genetics for chickens; all that talk about modifying genes and self blue turning red to pale yellow has my head hurting
