age and ripening of gelatine emulsions
I wonder if this is the case for ALL photo papers, or just the paper made in the particular plant that Lodima will be made at? Surely Kodak, Ilford and Fuji (big three) have air conditioning and humidity control to be able to continuously make paper products year round? I know Lodima will be made by a smaller factory, but wouldn't all film and paper factories have the facilities to make their products year round?
i haven't touched a sheet of azo in twenty yrs -----BUT-
if azo was the last comercially made emulsion that was a modern child of the original gaslight papers(i dont know-ask photo engineer) then it was a formula that has dffernt aging characteristics than the modern emulsions which are full of restrainers that allow non-refrigerated storage
film emulsions must be refrigerated to retard age ripening which causes speed and contrast changes even in the newest emulsions
there are many people who are hand coating supports with emulsion formulas that are the same as the original gaslight papers that azo was emulating
these formulas are made when needed and aged to the state that is required for the specific end in mind-used fresh it is one speed and contrast- a 1 week ripening is more stable but dffernt and so on and so on
this pertains to the emulsion before it is coated, and also to the emulsion after it is coated on the support
this is usually a plain silver/salt gelatine emulsion-mostly uv sensative -and it may be modified with iodides and bromides-even the differnce between chrome alum as a hardener and potasium alum affect these ageing characteristics and the speed and contrast
i guess since this work is mostly done in countries that don't speak english that is why you folks are not aware of being able to make your own azo precursors and modify them to be azo if you wish
ask photo engineer-ron will tell all he knows
thanx for the time and attention
vaya con dios