Kodak Professional Paper Developer is a powder developer for black and white paper making 3.78 litres (one US gallon) of working solution.
What it is for
Image tone from neutral to warm black. The maker names the practical advantage outright: the solution holds up well in an open tray — which is exactly what usually spoils a printing session, the developer oxidising before the prints run out.
How to dilute it
The solution is replenishable — kept and reused, with development time extended as it exhausts. Keep count of the films put through it; that is the only way to avoid an underdeveloped roll at the end of its life.
Storage
Sealed powder keeps for years; mixed solution keeps far less well, so mix what you will use. Dissolve at the stated temperature and in the stated order — getting the order of components wrong ruins a developer more reliably than any timing mistake.
How it compares
The classic choice for long printing sessions. ADOX Neutol gives a more neutral tone and the Separol line a safer formula; Kodak trades on staying power in the tray.
