Quote Originally Posted by jp498 View Post
Follow Johns advice to get a coffee developer. Foma (or Efke which isn't really available now much) in Caffenol-C was nice and grainy for me.
Now that I think about it, this was the grainiest developer I've made:

40g/L Ascorbic Acid (12g/300ml) (not Ascorbate, amount in Ascorbate is higher)
2g/L Potassium Bromide (0.6g/300ml)
1.67g/L Benzotriazole (0.5g/300ml)

Add sodium carbonate until solution is neutralised.

Add sodium hydroxide until pH is 12

Use undiluted, process was about 6-10min at 24 celsius for most films iirc.

I should also mention its a high contrast developer.