Related Clues:

• British fertilizer
• S
• Chemical salt
• Saltpeter: Brit.
• Saltpetre
• Fertilizer ingredient
• Compound in fireworks
• Explosive stuff
• Saltpeter
• Compound used in fertilizers
• Fertilizer compound
• Fertilizer component
• Gunpowder component
• Saltpeter, to a Brit
• Explosives ingredient