File:Blue Light.JPG
Summary
| Description |
English: Blue light, a pyrotechnic composition commonly used in the 19th century for night-time signaling and general illumination. Modern reproduction of the 1863 recipe listed in The Ordnance Manual for the Use of the Officers of the United States Army. |
| Date | |
| Source | Own work |
| Author | Hunleybluelight |
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