Can't swear to it, but I'm guessing ZnO sunscreen predated the modern plastics industry by a century or two....
Bob
On Monday, August 22, 2022 at 01:20:36 PM EDT, Arnold Trachtenberg via pbs <pbs@lists.pacificbulbsociety.net> wrote:
Shmuel
I guess the elders in terms of sun protection were spot on
Arnold
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