also: ようそでんぷんはんのう
noun
iodine-starch reaction
A chemical test in which iodine solution turns blue-black in the presence of starch; commonly used in school science experiments.
理科の授業でヨウ素デンプン反応を観察した。
We observed the iodine-starch reaction in science class.
Standard modern spelling using the preferred kanji ヨウ素 for iodine.
Older spelling with 沃素 (iodine) and 澱粉 (starch); now largely replaced by ヨウ素デンプン反応.
Compound of ヨウ素 (iodine), デンプン (starch), and 反応 (reaction).