Okay the proof versus Crystal Berry finally came through:
Mating Slushy (showing OdySlush) with Burlington (showing Crystal Berry) produces Oliver (who shows Crystal Berry). When mated with a more recessive eyed cat - Edie showing Peach Bellini, they produce Trifoil who shows the OdySlush and must have pulled it from Oliver from behind the Crystal Berry.
Moving on now to Ody Slush versus Canary. That may almost place it, except that I think a test versus Frost is also needed.