Caffenol

Caffenol film developer

Water8fl oz
Arm & Hammer Washing Soda2tsp
Folger's Coffee Crystals (not decaf)4tsp
Mixing Instructions: Mix soda until completely dissolved and solution is clear. Add coffee, mix until all grittiness is gone and solution is uniform. Let stand 5-10 minutes until microbubbles clear. Use within 30 minutes.
Dilution: Use undiluted.
Usage: 30 mins.

Notes 

Gives imagewise stain and general (fog) stain. All teaspoon measures should be level, or slightly rounded for coffee crystals.