Hi, As I've now finished making my printing frame, I want to start using print-out paper to 'convert' my glass negatives to a positive print. I've ordered the Potassium Ferricyanide and Ferric Ammonium Citrate, but wherever I look, I find differing quantities required. In my c1900 book 'Everyones Guide To Photography' it uses... Potassium ferridcyanide 75 grains (4.85g) Distilled water 1oz (28ml) Ammonio-citrate of iron 96 grains (6.2g) Distilled water 1oz (28ml) In the text from the site that is supplying the chemicals they use 2:1 Ferric Ammonium Citrate: Potassium Ferricyanide, and on the Alternative Photography website they use 25g Ferric... to 10g Pot Ferr.. What sort of ratio do you recommend? Does it matter that much? What affect does changing the ratios have on the final print? Thank you in advance, David.