Blue Fire

Prep. 1. From metallic antimony, 1 part; sulphur, 2 parts; nitre, 5 parts. 2. From realgar, 2 parts; charcoal, 3 parts; chlorate of pota a, 5 parts; sulphur, 13 parts; nitrate of baryta, 77 parts. 3. (Mr A. Bird.) Charcoal and orpiment, of each 1 part; black sulphuret of antimony, 16 parts; nitre, 48 parts; sulphur, 64 parts. 4. (Fownes.) Tersulphuret of antimony, a part; sulphur, 2 parts; dry nitre, 6 parts. This is the composition used for the Bengal or blue signal light employed at sea. 5. (Prof. March and.) Sulphur, sulphate of pota a, and ammonio-sulphate of copper, of each 15 parts; nitre, 27 parts; chlorate of pota a, 28 parts. For theatrical illuminations. This may be rendered either lighter or darker coloured by le ening or increasing the quantities of the sulphate of pota a and ammonio-sulphate of copper. 6. ( Light blue —March and.) Sulphur, 16 parts; calcined alum, 23 parts; chlorate of pota a, 61 parts. 7. ( Dark blue —March and.) Calcined alum and carbonate of copper, of each 12 parts; sulphur, 16 parts; chlorate of pota a, 60 parts. 8. (Marsh.) Sulphate of copper, 7 parts; sulphur, 24 parts; chlorate of pota a, 69 parts. 9. (Ruggier i.) Nitre, 2 parts; sulphur and zinc, of each 3 parts; gunpowder, 4 parts. 10. From sulphur, 1 part; dried verdigris, 2 parts; chlorate of pota a, 9 parts.