Hello friends,

This is General Knowledge Quiz Contest - 38.

Test your General Knowledge participating by giving answer in comment.

Question:

Which of these is essential to the production of glass, rayon and cellophane, soaps, detergents, dyeing textiles, water softeners, most photographic film developing agents, and in toothpaste?

Options:

A
Calcium fluoride
B
Soda ash
C
Caustic soda
D
Ferrous carbonate

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