Radish seedlings

I put the radish seeds in Wednesday last week and here's what they looked like Monday (5 days later). These are seeds from 'Long Black Spanish' and 'Roseheart' roots that I grew last Fall and then overwintered in the refrigerator in a ziplock bag. I'm hoping some intercrossing occurred and I'll find some F1 hybrids among these seedlings. I like the cool looking purplish-tinted foliage ones - I wonder if that's linked to any other trait like root flesh color? This year I also planted 'Round Black Spanish' and daikon to add to the mix.