Substance Used to Make 78 Rpm Gramophone Records
Puzzle 6 of Footwear Medium Pack
Question is: Substance Used to Make 78 Rpm Gramophone Records
and the answer is: SHELLAC
Word Meaning:
SHELLAC — A processed secretion of the lac insect, Coccus lacca; used in polishes, varnishes etc.
Definitions from Wiktionary.