Beginner Gardening: Purple veins/spots and curled leaves on tomato plants..., 1 by lemoncuke

lemoncuke wrote:
Hi everyone,

I received two tomato plants (a Reisentraube and a Pink Brandywine) from a friend of mine, which she grew from seed. When I got them, they were living in greenhouse, but my cold frame wasn't ready, so I brought them back inside and put them back under lights. When I got them, I noticed they had some red/purple veins and a little bit of curling, but I thought they were just a bit cold. However, they still have it and I am not sure what to do. I was planning to pot them up to bigger containers today, but I want to see if they are worth saving. The smaller plant looks especially nice on the top and seems otherwise healthy (the Reisentraube) but the Brandywine looks a little sickly to me. I've attached some photos and would love to know what you think!

First photo: Underside of brandywine leaf