OBA non OBA lifespan ?

Started 1 month ago | Questions thread
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Ken60 Senior Member • Posts: 1,372
OBA non OBA lifespan ?

Is there any general comparative in longevity between an OBA free paper IFA 11 and one with slight whitening IFA14 for example.    Or Fotospeed NST and NST  Bright White.

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Gear ... what I need to get the job done , after all you don't see mechanics listing their brand of spanner as a qualification .

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