For this time I've used some 60's expired Ilford Cine Film and my pinhole camera. The test came out much better than the previous caffenol results I had... I guess I'm getting used to the recipe!
Here's what I've done for this time, In the given order I've diluted each ingredient in water for a 350ml solution:
19g - Washing Soda
05g - Vitamin C
03g - Iodized Salt
14g - Walmart own brand instant coffee
I processed de film for 15 minutes gently agitating continuously for the first 30 seconds, then 3x every minute.