u/Disastrous-Put6635

I had a minor ant issue in my room recently so i took all my plants out to another room in the meantime of handling it . I put my orchids in a windowsill and left them there for less than a week . Went outside today and from the window i noticed the awful discoloration on the leaves . what happened and what can i do about it ? can they be saved ?

they were very healthy and i would like to think i take good care of them . I have had the one on the right for about 2 years now and the other for a few months .( I am aware i did cut the stem a little late on one it but aside that i have had no issues with either of them )