red phosphorus
Chemistry term for the red allotrope of phosphorus, used in match heads and flame retardants.
マッチの側面には赤リンが使われている。
Red phosphorus is used on the side of matchboxes.
Kanji form using 燐; less common in modern chemistry contexts.
Compound of 赤 (red) and リン (phosphorus), from the color of this allotrope.