sun scald

Fellow Gardeners,

This is the first time I have this problem. I  normally buy tomato plants on the local market, which I plant in the allotment a few days later.
This time I received some plugs throught the post. They started to grow quite nicely in pots up in the attic so I decided it was time to acclimatize them as they weather had improved.
Their first day outside I noticed palish blotches, so the second day I kept them a bit in the shade. I have been doing these for a few days now but the palish blotches are getting worse. I browsed a bit on the Internet and I now realise I should have started off with exposing them to very short period outdoor and gradually increasing the time.
Have I cause them irreparable damage? Is there anything I can do to remedy the situation? Help please?

Anton

Thanks a lot for your answer.  By the way, what do you use for pruning, scissor, knife or snap things off?

Anton

I use a sharp pair of secateurs as they give a nice clean cut. Snapping stuff often leaves a wound that is more likely to get infected.