Substance that allowed the Montgolfiers' craft to fly

Let's find possible answers to "Substance that allowed the Montgolfiers' craft to fly" crossword clue. First of all, we will look for a few extra hints for this entry: Substance that allowed the Montgolfiers' craft to fly. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.