Answer: crucibles

AnswerCrossword Clue
CRUCIBLESMelting pots
cruciblesA ceramic or metal container in which metals or other substances may be melted or subjected to very high temperatures
cruciblesA place or occasion of severe test or trial
cruciblesCRUCIBLE, a heat-resistant vessel
cruciblesA place or situation in which different elements interact to produce something new