Question
What does a dark color indicate when using Lugol's iodine?
The presence of starch
The presence of sugar
The absence of starch
The absence of sugar
The presence of starch
The presence of sugar
The absence of starch
The absence of sugar
Answers
GPT-4o mini
A dark color when using Lugol's iodine indicates **the presence of starch**. Lugol's iodine solution reacts with starch to produce a blue-black color. If there is no color change, it indicates the absence of starch.