Someone mentioned recently that for interim, or ad hoc, or temporary blackening of clips, etc, that you could use a black Magic Marker or similar permanent ink felt tip marker. If you prefer a more finished, refined option, call around to any power-coat places you may have in your area - often, if they are about to do a batch of someone else's stuff in whatever color you would like, you can slip some small pieces in for a nominal fee.
HTH!
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Things are more like they are today
than they have ever been before.