Potential answers for "Glassmaking material"

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

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