Quote Originally Posted by RalphLambrecht View Post
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.
So if I have got this right, you can not see the actual black number through the print, as shown by your not seeing it when you have a black easel.

but when light is reflected back by the white easel, You can see the number.

So the number would be appearing whiter? since the reflected back light would make the print darker everywhere except the opaque number, where no light would pass through to fog the print.
Is that right ?