Since it looks as though Agfa black and white products will soon finish, I'm interested in making something as close to Neutol-WA as possible. We all know that an MSDS is not a formula, because the exact amounts need not be shown, and some ingredients might not be shown if they are in small proportions and/or are harmless. I have several Neutol-WA MSDS documents from different jurisdictions, and to comply with local laws they show different ranges for the components (some ranges much tighter than others), and in some cases they show a code that seems to indicate some info about the amount. What I have come up with using the tightest ranges is (concentrate): water 55-60% Potassium sulphite 15-20% Potassium carbonate 15-20% Potassium bromide 0.1-1% (code PA3, meaning it's 3% or more, and NJ4, meaning it's greater than 1% ? So maybe the 0.1-1% is wrong.) Hydroquinone 1-5% (no code PA3, meaning it's less than 3%) EDTA tetrasodium salt 1-5% (code PA3, meaning it's 3% or more) PA3 = Pennsylvania Non-hazardous present at 3% or greater NJ4 = New Jersey other = non-hazardous included in 5 predominant ingredients greater than 1% One of the codes contradicts the stated quantities. I'm not worried about the bromide, since a bit extra is often added to warm tone developers. Any suggestions for the quantities of hydroquinone and EDTA t.s.s? FWIW, the density of the working solutions is given as: 1+7 1.050 to 1.056 1+11 1.034 to 1.040 Does anyone have any further ideas for a formula, in particular the quantities for the ingredients present in small concentrations? Or maybe other ingredients not shown at all?