Yellow Food Dye

About Yellow Food Dye:

• It is also known as tartrazine and is a synthetic food colorant classified as an azo dye.
• It is lemon yellow in color and water soluble.
• It is used in many dairy products, beverages, desserts and confectioneries etc.

Highlight of the study

• This dye absorbs blue light strongly, which yields its characteristic orange-to-red color when dissolved in water.
• This happens because the blue part of the light is absorbed, leaving only the orange-to-red part visible.
• Normally, biological tissues scatter light due to their diverse composition of proteins, fats, and liquids.
• Researchers found that a concentrated tartrazine solution can match the refractive indices of these components, reducing light scattering and allowing light to pass through. This makes the skin appear transparent.
• When applied, tartrazine absorbs certain wavelengths of light, especially red light, changing how light interacts with the tissue.
• This effect enabled the researchers to see blood vessels, internal organs, and muscle contractions in real-time.

Potential Applications

This technique could simplify blood draws, improve laser tattoo removal, and aid in early cancer detection.

Q1: What is the Refractive index?

It is a measure of the bending of a ray of light when passing from one medium into another.

Source: Scientists use common yellow food dye tartrazine to make skin transparent, see internal organs inside body

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