noun
luminol reaction
A chemiluminescent reaction used in forensic science to detect trace amounts of blood; the luminol reagent emits a blue glow upon contact with blood.
現場でルミノール反応を試みたところ、血痕が浮かび上がった。
When they tried the luminol reaction at the scene, bloodstains appeared.
From English 'luminol' (a trademarked chemiluminescent compound) + 反応 (reaction). The term is a direct borrowing and compound used in forensic chemistry.