Most zinc plated fasteners have a tiny amount of zinc on them, just enough that they look pretty on delivery. This is very easily removed in some old battery acid overnight if you really hate it. When you pull them out give them a good wash in clean, hot water and ideally a dip in a phosphoric acid based rust remover.
I totaly agree about no Phillips/Pozy screw heads but there are some Phillips heads that were originally used in the turret of Shermans which really suprised me. From memory they are in part of the stabliser mechanism.
David
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