Misting bad for Oncs and similiar orchids?

[greenpassion]

In my searching for info and advise about what could be the problem with my oncs and ondoto's, I came across a thread where posters were saying that they knew that misting oncidiums is not good, that it causes leaf spots. I had not been aware of this. I use RO distilled water in a hand sprayer and often mist my orchids, oncs as well as phals. Is this wrong? And the 'leaf spots' aren't like water marks, they're black, yellow, and spread.

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