For breeding purposes...what 'color' is a Speckled Sussex?

[RcoM]

I don't have a whole lot of working knowledge of the lavender gene, but from what I understand it dilutes both black and gold. For porcelain you would want to cross speckled Sussex with lavender. Then cross the resulting chicks with each other. Regardless of what non-lavender color you start with you're not going to get lavender chicks in the first generation because lavender is recessive and you need two copies for it to show.

Yes I realise it takes a generation or two. I have coronation which have Lavendar at their necks and tail region and are a double recessive gene. I hope the resulting chicks from the speckled x Coro (which will look speckled) bred back will produce some split or Porcelain chicks or it may take 2 generations. I just don't know whether it will work on a Coro- who has part Lavendar part white body. Am I missing some inporayht info- such as the Colombian gene? Should I work with a silver speckled sussex rather than a brown?

 

[AinaWGSD]

When you say porcelain, are you thinking a pattern like porcelain d'uccle?

Chickens for backyards
If that's your goal then you'll definitely want to use speckled Sussex because silver won't give you the gold background necessary for that. It also won't give you the mottling you'll need. If I were trying to create this pattern I would probably use a lavender orpington to introduce the lavender gene and cull hard for type. But if you already have coronation Sussex it makes sense to start there.