Response to Controlling HP5+ grain...agitation to blame?

Overexposing any pictoral film reduces sharpness because of light scattering in the emulsion, AKA irradiation. With minimal exposure much of this scattered light remains below the threshold to produce density in the final image. Grain increases because the higher the density of silver grains the closer the grains are to each other and the greater opportunity to clump together. Many, many photographers over many, many years have observed this. Search the literature of the manufaccturers etc. and you'll find documentation of these facts.

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