Answer: sulphur

AnswerCrossword Clue
SULPHURElement used for vulcanizing rubber.
SULPHURSmall, yellow butterfly.
SULPHURYellowish butterfly
SULPHURGunpowder ingredient
SULPHURGunpowder ingredient (Var.)
sulphura non metallic element / to treat with sulphur, also SULFUR
sulphursulfur