Here's a couple threads I think I replied in more detail on the subject.
https://www.backyardchickens.com/threads/my-head-hurts-breeding-mauve-orpingtons.864186/
www.backyardchickens.com/threads/chocolate-and-blue-orpington-color-genetics.1219858/
https://www.backyardchickens.com/threads/my-head-hurts-breeding-mauve-orpingtons.864186/
www.backyardchickens.com/threads/chocolate-and-blue-orpington-color-genetics.1219858/