Those disgusting brownish patches on the first Phalaenopsis are from sunburn.
Phalaenopsis enjoy a bright windowsill but they do not like direct sunlight.
Depending upon temperature and strength of the sunlight, this burn could appear in a few minutes. Shortly thereafter, those scaly brown patches appear.
Orchids in general are not good candidates for foliar feedings. I have heard numerous speakers mention that. It is much better to have it absorbed through their roots.
