Have you ever tried to burn in a hot spot in a print but it just wouldn’t stop being as white as your paper’s base?
This happens from time to time, and can ruin your whole day.
When I run into problems like this, I solarize part of the image. I remove the print from the developer about 1/2way through its development. I take a paper towel and dry the print off, and align it under the enlarger. (I have a safelight filter to render the light useless so I can set the print up. ). I use my hands to burn and dodge use whatever you usually use.
You don’t need to burn in the hot spots much, it is just to give some texture to the whites. You put the image back into your developer and finish the process. You will have to experiment with the time you are burning the print.
Sometimes a little goes a long way.
If you have a hydroquinone-free developer, solarization work best with them.