My cattleya pseudobulbs are turning purple...

[brianwstephens]

The purple usually indicates that the plant has been exposed to maximum light levels, so keep an eye on it but don't worry

[rbarata]

Example: a new pbulb growing in my catt (quick photo=crappy photo).
The purple is useful because it gives me an indication about the light levels.

[estación seca]

Looks extremely healthy!

[rbarata]

Purple in leaves is related with levels of a pigment called anthocyanin. When light levels increase scientists say it's levels increase to protect the leaves from being damaged. Think of it as the same process that occurs with humans when tanning.