I have a 'Telfan' X self seedling that has that kind of variegation as Don's semp. It is a variable anthocyanin gene, similar to the dotting and splashing you get on corn kernels. My seedling turns all purple so it loses the effect of the variegation.
This is different than the chloroplast variegation that is due to a mutation affecting chloroplast development. Most of these that have occurred in the past of this type have not been good growers or lost their variegation. This new one looks to be a stable chimera, however.
Kevin
