Glad you got some poults to hatch!! I have 12 right now that are all to. RP x BS. Blues, blue mottled and black mottled. Ranging from 1 to 3 weeks of age. sold out of the pure RP for now. Need to sell some of the mixes!!'
I have to stop letting people but them so I will have choices. Lol my BS hen is raising 2 mixed poults now, but everything else has sold. ALL of hers have come out looking the same, a somewhat bluish color, & the 2 she has have some white in their feathering. So I'd assume they are both mottled blue, maybe some just blue? Do the mottled blacks come out black?
If you haven't gotten any black yet then you may be a step ahead & have a lavender tom over the royal palm hens (assuming your hens are the palms). If your tom is "slate" post a pic & I can tell you if he's actually lavender. If he is, you will get all blue mottled this generation.