Today, using the same recipe that already worked, I got very weak results, almost blank negatives. I don't know what I did wrong, I am still looking for the reason of the failure. I only regret the amount of coffee that I poured out down with hair dye and soda.
So, please don't use Caffcol III yet. It needs some more tests. I am sorry if you tried and didn't work too.
As soon as I find the error, I will let you know.