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Note: Do not rely on this information. It is very old.
Bologna Stone
Bologna Stone, natural sulphate of Barium, by partial reduction on charcoal gives a phosphorescent mass of sulphide and sulphate of Barium, known as Bolognian phosphorus.
Bologna Stone, natural sulphate of Barium, by partial reduction on charcoal gives a phosphorescent mass of sulphide and sulphate of Barium, known as Bolognian phosphorus.