But the new project I have is to find a based on coffee and vit. C developer that works similar to Parodinal. I started calling it Caffedinal but I worked so hard until I got reasonable results that I changed the name to Caffernal. I am still experimenting but I can already say it will be a reality. The photos below were made using a 1:25 solution and 20 minutes at 27ºC and I think it will work at 1:50 solution too, already tried but the duration was short (45 minutes), images too weak.
The final recipe is still not fixed but it is more or less obvious that coffee, vit. C, Sodium Hydroxide and a pinch of preservative and restrainer will also be included.