走はしり炭ずみ

noun

exploding charcoal

Refers to charcoal that pops or sparks when burning, often due to trapped moisture or air pockets. Compare with 跳ね炭, which also means popping charcoal.

See also: 跳ね炭

• 走はしり炭ずみに注ちゅう意いして、火ひの粉こが飛とばないようにしてください。

  Be careful with exploding charcoal so that sparks don't fly.