Potential answers for "Ingredient in glassmaking"

⭐⭐⭐⭐ SILEX
⭐⭐⭐ FRIT
⭐⭐⭐ POTASH
⭐⭐⭐ SAND
⭐⭐ STHELENS
⭐⭐ HELENS
⭐⭐ FIRINGS
⭐⭐ LEHR

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