Brussel Sprouts - Pink Inside

[Rella]

I bought a sack of brussel sprouts, cleaned and blanched them 4 minutes, then froze.

I notice that some of them have pink-ish leaves inside, some do not. Is this a sign of some of them being riper than others.

[greygarious]

I've seen and eaten such sprouts without noticying any difference, but have no idea of the cause.

[EricMM]

It could be the variety. There is a red variety called Rubine, and I've frequently had regular sprouts that had slightly reddish or pinkish leaves...but always on the outside. Cool temperatures and strong light can cause a build-up of anthocyanins, a reddish plant pigment. However, if its pink on the inside and green on the outside, I've never seen that before.