It's a lot more complex than that - as I understand it from hearing an interview with one of the senior emulsion chemists at Ilford (cannot remember where it is posted, but it's from a podcast from one of the factory tours), they took over with the intention of learning the recipes & techniques over a number of months prior to transferring production to Mobberley, but when their senior engineers went in, they had kittens over the non existence of basic workplace health & safety - lack of machine guards on coating equipment used in low light levels & open reactor vessels were two that were cited specifically. They had to shut the plant down very quickly, then try & re-make the emulsions at Mobberley without the 6 months learning they'd planned on. I recall that the POP went because it presented 'unacceptable risks' to those manufacturing & coating it, Kentona went because it probably needed a massively costly re-engineering job relative to its sales potential. ART300 is clearly a descendent of the ideas of similar Kentmere papers, but on a far nicer base.
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