cyanotype of one of my coffee developed negatives. I used a lot of coffee and washing soda in my recipe so my negatives came out very very brown. This meant my exposure time went way up but I like how it came out. Maybe low contrast negatives are better for cyanotype sometimes.
Also this paper seems to have been in the batch of papers I coated when first testing the different coloured papers... that'd make it two months old and all the special treatment it's had is to be loosely wrapped in foil for all that time. No base fog. I think the fogging over time thing might be material dependent.