[Avodah] Black on black tefillin retzuos

[Marty Bluke via Avodah]

I am looking to get new retzuos as the paint is peeling off my current
retzuos. There seem to be 2 basic options, the traditional black on one
side white on the other and the new black on both sides. Anyone have any
experience with black on black? Does it really last better?
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