Hello guys,

Today I got something unexpected! I use Fomabrom 111 FB glossy paper which have a white base that I personally like.
Yesterday I was printing a negative and since I didn't finished I kept all the same settings for todays print.
When I was to start, the lamp of the enlarger was "dead", so I changed for a new one. After the first print came out, I noticed that the tone of the paper was no longer white ( as it used to be, even compared with the prints from the day before ), but had like a warm / yellow tone ( on the image itself and in the borders, where no light should hit).

After that, I changed for another batch of paper, got the same results. Then switched the developer for a new one ( I use Ethol LPD ) and got the same results. Then I switched off the safelight near the enlarger..and the warm tone appeared again, it was no longer with a white base!

The fixer ( Ilford Rapid Fixer ) was relatively new, and the stop bath ( citrin base ) was still on the safe range that I normally use.

Anyone had experienced similar problems? What could be the cause?

Thank you in advance
Best