Chris, the lack of mottling is one reason some judges dislike calling them porcelain. I personally believe they do need the mottling added, and am working on it (and having a dickens of a time getting back to type!), but as an additional recessive gene, it takes time to get it into them in pure form.
I do believe that mottling will look less cohesive on soft silkie feathers than on harder non-silkied feathers.
I do believe that mottling will look less cohesive on soft silkie feathers than on harder non-silkied feathers.