Answer: It sounds like sunburn. I'm having the same problem with my transplants--I left some of them outdoors thinking it was going to be a cloudy day--but it was sunny all day and they got burned. Fortunately, most plants will recover, as long as the growing point was not damaged. Next time, try to acclimate the plants gradually to the outdoors--place them in a sheltered spot for a few hours the first day, increasing the amount of sun and length of time they're outdoors over the course of a week or two.
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