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Any F1 cross of a homozygous blue egger bird, and a dark egger bird will give you "olive eggers". No, you do not - unless you are unsatisfied with the F1 crosses' egg color. Crossing them back to a homozygous breed for white eggshells will give you less olive egger birds from the cross.
Using a punnet square, all F1 cross from a homozygous blue egger cross will make Bw chicks (using B for dominant blue eggshell color, and w for recessive white eggshell color. Brown is an "overlay" of color, not a shell color.)
Crossing the Bw F1 offspring with a ww rooster, using a punnet square will give you these choices - Bw, Bw, ww, ww. So, only 50% of those second crossing chicks will lay olive eggs; the other 50% will lay dark brown.