The other week we mixed up a couple of liters or Caffenol CCM in the darkroom. One guy processed a roll of film using 600ml & another guy decided to use the rest to process some paper. He was using Ilford MGIV fibre base & it developed nicely. He was doing comparison prints in Dektol and there wasn't much difference in appearance. I'm not sure if he had to alter the print times but I'm pretty sure dev times were longer in the caffenol. There was a paper stain but I think it washed out with a long wash. Will check next time I speak to him.