Tag: Blue black color

Over 50% of the food we consume contains some form of starch, making the iodine test a fundamental scientific procedure. A positive iodine test, used to detect the presence of starch, is identified by a dramatic color change from the original yellowish-brown iodine solution to a deep blue-black.

The iconic iodine test for starch has been a staple of biology and chemistry labs for over two centuries, first documented in 1814. This qualitative experiment reveals the presence of starch through a dramatic color change, a phenomenon rooted in the complex molecular structure of carbohydrates.

According to the National Institutes of Health, starch accounts for approximately 50% of the carbohydrates humans consume, making its detection an important scientific process. When starch is present, particularly during an iodine test, a specific and noticeable color change occurs, indicating a positive result.