Splash X Splash results in 100% splash offspring, so she must know her genetics just fine.
I have heard that the more generations of Splash X Splash you breed, the more washed out they appear as well.
This is how Blue, Black, Splash works:
Black X Black = 100% Black offspring
Black X Blue = 50% Black offspring, 50% Blue offspring
Blue X Blue = 50% Blue offspring, 25% Black Offspring, 25% Splash offspring
Blue X Splash = 50% Blue offspring, 50% Splash offspring
Black X Splash = 100% Blue offspring
Splash X Splash = 100% Splash offspring
ETA: Great minds...

This is how Blue, Black, Splash works:
Black X Black = 100% Black offspring
Black X Blue = 50% Black offspring, 50% Blue offspring
Blue X Blue = 50% Blue offspring, 25% Black Offspring, 25% Splash offspring
Blue X Splash = 50% Blue offspring, 50% Splash offspring
Black X Splash = 100% Blue offspring
Splash X Splash = 100% Splash offspring
ETA: Great minds...

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