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Something is wrong with my tomato seedlings, just as they were last year and the year before. The seedlings are about 2" high, but are very sickly looking. The undersides of the leaves have turned purple and the leaves are curled, and the tops of the leaf are very pale. The soil I planted them in was a mix of black earth and vegetable soil. I suspect the soil or the water, although I do let the water sit 24 hrs prior to watering?
Is there anything I can do to save them at this point?

Sounds like over fertilization but then I could be wrong.

I have noticed that tomato plants are different colors of green some very light and some much darker. What type of tomatoes are they?

Purplish leaves may be caused by
Cold Temperature. Temperature is too cold for the tomato seedlings.

Mineral deficiency
see photos here.

Leaf curl or roll maybe caused by
excess moisture
excess nitrogen
transplant shock
viral infection

See also symptoms, possible problem, possible solution at the link below.
Tomato Troubleshooting Chart.

Herbicide damage, and viral damage are irreversible, I still think there was something in the soil I've been using for the last 2 years.. My tomatos looked the very same sickly last year, and I used the same store bought soil.
I don't think they will improve, they never last year.

I start all of my tomatoes indoors using Whitney Farms seed Starting Mix, and I've never had any problems with bad starts since. One year, I used a cheaper brand from the local hardware store, and I lost about half of them. Another year I used a heavily composted soil and ended up with deformed plants. A good seed starting mix seems to be the key for me, but temperature and adequate light are equally important.

Normally I would have questioned my seed, but I planted a variety, some of which were my own seed. They are starting to improve but still have purple undersides. I think it was in the soil, either too rich or the soil had pesticides or a virus in it.
I could transplant them into new soil to rule out too rich of a soil, but at this stage, I don't think I want to be bothered.