Bengal light

A Bengal light, also known as a blue light, is a pyrotechnic device that produces a bright light, formerly used for signaling and illumination. Historically, these lights were created using a mixture of sulfur, saltpeter, and orpiment, resulting in a bluish-white light. The name "Bengal light" likely originated because Bengal was a primary source of saltpeter.12

In pyrotechnics, a flare refers to a combustible device that emits a brilliant light. Modern flares, developed in the 19th century with the introduction of potassium chlorate, can produce various colors. These are often used in military operations, for highway safety, and as standard equipment in ships' lifeboats for signaling.2