Caffenol Black

Caffenol film developer

Water1000ml
Soluble Cheap Coffee (not decaf)20g
Washing Soda (Anhydrous Sodium Carbonate)5g
Mixing Instructions: Mix coffee in 1/2 liter water until it has no grain. Add soda, mix until all grittiness is gone and solution is uniform (if needed, add more sodium carbonate until a pH of 10.4 is achieved). Complete with water to make 1 Liter. Wait no more than 5 minutes until microbubbles clear. Use immediately as one-shot.
Dilution: Use undiluted.
Usage: 60 mins.

Notes 

Gives no stain, no fog and small grain. Thanks to Henrique Sousa for supplying this recipe.