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In both Millie and Porcelian there are several other varieties that can appear when at least one parent does not carry mottling. or if they carry but are not pure for mottling. from a cross with a non mottled variety with the Millie or Porcelian you can see buff, Buff Columbian, Buff Mottled, Gold neck, self Blue, Pearle, th elist goes on for a while.
But in Millie it is not uncommon for many breeders to use spangled (a parent variety in OE) to improve or darken color in teh millie. from that you can expect to see some very near spangled but often a touch light in hackle, saddle and wing bow of male, and slight stippling in female.