Castor Oil Plant

in Plants
My Castor Oil seedlings are coming on nicely, but they are completely green. They are from the same batch of seed that I grew last year, which was the dark red variety (collected when I was in Corfu a few years ago). Do the seedlings take a while to turn dark red? I seem to recall last year that the seedlings were dark red from the minute they germinated, but perhaps they took longer to turn colour than I remember.
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for the fag ends of the aristocracy.
S.Yorkshire/Derbyshire border