Quote Originally Posted by wiggywag View Post
How important is it to have a yellow easel compared to a white one, to avoid fog?

Which kind of papers are unsafe on a white easel?

Is it only when the light is very brigt, e.g. close to easel or full opening on the lense?

The color of the easel surface definitely makes a difference! You can test this yourself. Figure out what exposure you need to create a medium gray on your paper. Prior to making this exposure, mark the back of the print with a thick black felt-tip pen. Write a number on it or sign it. Then make the exposure and process normally. You should not be able to see your mark on the emulsion side after drying.

I did this test with double-weight Kodak, Ilford and Agfa paper and could clearly see the mark with white easels. They are now painted flat black and the problem is gone. I never had yellow easels, so I don't know how they are affected.