Double Hit Black Setup

hello - printed last publication of black , white photographs using duotone of k + pantone cool grey. current project (also b/w photos), looking higher contrast effect deep blacks, , wanted know doubling black (in ps) instead of using grey. can guide me strategy this? grey, amazed @ how closely (calibrated) monitor matched wet proof. close. feel can't trust eyes k+k, black looks black on monitor either way. thank you!!!

you have proceed caution.  paper determine total ink limit.  if have image shadow density of, 85% , double print 85%, ink going around 170%, dot gain put close 200% risk of puddling.  use same combination in previous setup of k + pantone cool gray , then, on press, switch cool gray ink black ink.  order press proof of each scenario , make decision based on that.  think double strike may much.

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