YOU SAID:

Iodine turns a dark purplish black when starch is present.

INTO JAPANESE

デンプンが存在すると、ヨウ素は濃い紫がかった黒に変わります。

BACK INTO ENGLISH

In the presence of starch, iodine turns dark purplish-black.

INTO JAPANESE

デンプンの存在下では、ヨウ素は濃い紫がかった黒に変わります。

BACK INTO ENGLISH

In the presence of starch, iodine turns dark purplish-black.