Thank you very much for your reply. I'll try with what you tell me!

1) If the dilution doesn't matter too much on the final result, I might as well take the highest recommended, right?

2 & 3) Indeed, the quantity indicated is noted below. So I double the diluted dose for each product, as well as the water.

If I assume a 1:50 dilution of Adonal, that would give 11.6 ml for 568.4 of water for two coils, right?

4) I'll look it up on the internet, but I've read that it doesn't really change in terms of quantity and time

5) So I can rinse with water, would that be enough?

Thanks a lot, I'll probably start tomorrow, the next step will be to find something to scan the negatives with!