What durable resinous substance, secreted by the lac insect, replaced zinc for consumer disc use?

Answer

Shellac

Moving from fragile zinc masters to the more durable shellac was essential for consumer use as it offered a harder surface that could withstand tracking force while still being pressable in molds.

What durable resinous substance, secreted by the lac insect, replaced zinc for consumer disc use?

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Emile Berliner, Kammer & Reinhardt Gramophones, First ... - YouTube

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