Response to highly diluted developers

The developer claps out in the dense areas of the negative, releasing bromide ions and other oxidation byproducts that inhibit development in the adjacent image areas. Only works if agitation is kept to a minimum as well. Goes hand-in-hand with 'compensating' development which curtails contrast by limiting maximum negative density. The technique runs the risk of overall underdevelopment by starving the film of developer altogether.

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