Burning of leaf tissue occurs when the cells overheat, desiccate, and die.
There is no healing process for that. In all likelihood, the area will turn
to a parchment beige, and is not posing any additional threat to the
well-being of the plant.

Unless you want to sacrifice a larger area of the leaf and remove the
portion that's damaged, leave it alone.

--

Ray Barkalow - First Rays Orchids - www.firstrays.com
Plants, Supplies, Books, Artwork, and Lots of Free Info!

.. . . . . . . . . . .
"Joe S" wrote in message
...
I have an Onc that got some extended direct sun on one afternoon. The leaf
surface that is "burnt" is kind of grey-green and spotted, whereas the
area on
the same leaf that was afforded some protection is nice and green.

My question...do leaves heal from such exposure? Will it stay the same?
Get
better? Worse?

Thanks in advance for your experience,

Joe