The color Lavender

I just purchased some Lavender Standard Cochins. I have a black hen already and a blue one...I understand that crossing the black with the Lavender will create splits, but what do the splits create? The purpose of crossing the black is to create more quality birds, but does the black help with the lavender color? The blue hen, as I understand it, cannot be used with the Lavender as it does not enhance the color...is that correct?
 
Lavender is self blue. When bred will produce all lavender. The color blue or Andalusion blue results in blue, black and splash though for showing purposes only the blue is allowed.

Breeding black (to improve type) with lavender results in splits, black color with lav gene. When the splits are bred together or back to lavender results in both lav and black. Half of those blacks will be splits.

Edit to add: I know black is needed to improve color in Andalusion blues as that blue is really just a diluted black resulting in grey blue so if your blue color is washing out breed back to the black offspring not splash. I wouldn't think black would help with coloring of lavender blue as it's its own color but then I don't know the self blue at all. Guessing black birds are used so the only split is lavender, if white bird you'll start muddying up the line with recessive white possibly resulting in sports of white birds. The black splits when offspring back to lavender are pure lavender; it breeds true down the lines.
 
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This is the chart I refer to when breeding Lavenders. The splits are birds that are not visually Lavender but carry one set of the gene. You need two copies for a bird to be Lavender. I only breed my Lavenders to Blacks so for me a split is a visually black bird who carries one set of the Lavender genes, and the Blacks are just that Blacks (do not carry the Lavender gene). I find with using Blacks it makes it easy to determine who the Lavenders are at hatch. I do not breed Lavenders to blues, splashes, or any other color.

Lav X Lav = 100% Lav
Lav X Split = 50% Lav, 50% Splits
Split X Split = 50% Splits, 25% Lavs, 25% Blacks
Lav X Black = 100% Splits
Split X Black - 100% Blacks
 
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