No, Splash is simply the full dilution effect of the gene. In partial dominance, as the flower picture shows above, the heterozygous individual shows a mixture of both homozygous possibilities for that gene. So a homozygote with the blue gene, Bl/Bl, is Splash, a grayish white color, while a homozygote
without the blue gene, bl+/bl+, is Black. A heterozygous individual (Bl/bl+) meanwhile is a color in between the two homozygous versions, blue-gray.
An individual heterozygous for a codominant gene shows a bit of
both the homozygous versions,
not a color in between, as the flower picture demonstrates. So for example the Paint or Erminette pattern is based on codominance with the dominant white gene on a solid black base. With these patterns, a homozygous individual for dominant white (I/I) is solid White, and an individual homozygous
without dominant white (i+/i+) is solid Black. The heterozygous individual (I/i+) is
not a gray color in between the homozygous colors like in partial dominance, but instead an individual who is white with some black patches. So a little bit of both homozygous colors shows up without either color being tinted or diluted by the other color. Does that make sense?
Edited for clarity
