sun scorched tomato plants what can I do?

My tomato seedlings (about 4 inches high) have been in the greenhouse each day and taken in at night.  I think they got sun scorched as they are pale yellow with white patches that look like the leaves are burnt.  They don't look too healthy and some of the leaves are a bit curled.  Is there anything I can do to save them?   I will be so sad if I have lost them all, they are a mix of lots of different varieties and I have been so good this year in just growing one or two of each type. 

I'd stick with them but try to give them a little diffuse shade during the day, they should pull through.

Depending on when you potted them on, it might be worth giving them a little feed just in case they're getting low on nutrients.

yes it was epson salts   dose is 1 teaspoon to a gallon of water

Give them some shade, the damaged leaves won't recover, but any new leaves will be ok.

Are they in separate pots, Under?

You could just let them recover on the greenhouse floor for a while during the day, and as said here, you'll probably be OK with a little TLC!

I always associate yellow leaves with lack of nutrients, Dave