Senko Hanabi being held in a hand.One variety of Senko Hanabi sparkling at night and then dropping when done.
Senko hanabi (線香花火senkō hanabi ) (sparkler - literally: incense-stick fireworks) is a traditional Japanese firework. Essays about them date back to at least 1927.[1]
They are a thin shaft of twisted tissue paper about 20 centimeters long with one end containing a few grains of a black gunpowder. The black powder composition consists of three basic chemicals: potassium nitrate, sulfur, and charcoal.[1]
The pointed end is lit and held straight down, so that the flame is at the bottom. After a few seconds a glowing, molten slag will form. This is reportedly potassium sulfide, which contains carbon from the charcoal. The molten ball will ignite the second phase of the senko hanabi, silently spraying an array of delicate branching sparks with a range of up to 20 centimetres (7.9 in).[2] They are ignited away from the wind and held with a steady hand, so that the delicate molten head does not drop and that the two phases of ignition are completed. Senko hanabi are included in packets of fireworks and are ignited last amongst other fireworks.[3]
One theory for its distinctive sparks suggest that when lit, firstly the gunpowder burns and later form a blob of molten slag containing potassium sulfide, potassium carbonate and much more, these further react and decompose into gases like CO, CO2, SO2 which erupt out of the from the molten blob and carrying small amounts of slag in the process. These fragments further divide into minuscule bits due to wind, thus creating this magnificent effect.
Senko hanabi are said to somehow hypnotize the watcher into silence and to evoke mono no aware (translated as "an empathy toward things," or "a sensitivity to ephemera"), a Japanese term describing a flash of sadness felt when reminded of the beauty and briefness of life. "The poignantly ephemeral has long been appreciated in Japan and is still felt in the quiet celebration of senko hanabi."[3]
^ abShimizu, Takeo (1996). Fireworks: The Art, Science, and Technique. Austin, Texas: Pyrotechnica Publications. ISBN 978-0-929388-05-2.
^"How To Make Senko Hanabi Sparklers". Skylighter.com. Retrieved December 27, 2009.
^ ab"Senko hanabi". tokyoq.com. Retrieved December 27, 2009.
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