Swedish flower with blue/splash lacing?

[TinyRaptorDodos]

My Swedish flower roo, Biscotti, has always had beautiful colors… but now that he’s fully feathered out with adult roo feathers I've noticed he has blue/splash lacing on his chest. Is this normal or is he not pure?

 

[Fluffy_Moth_With_Silkies]

Some Swedish Flowers have lacing, but I've never seen one like that before! I'd probably say it's pure, but I'm not great at breeds.