The deep black shimmer will disapear by the time and it has to be renewed again and again - best on April 1st once in a year ...
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Peter
I've been known to use black shoe polish on old faded cones, it does not seem to need renewal. (I only applied it to torn cones that had been glued back together with black 3M glue because the glue lines were so visible...) Someday those 2123's will get new cones!