What happens when inks and dyes are exposed to sunlight for a long period of time?

What happens when inks and dyes are exposed to sunlight for a long period of time?

• A. They bleach or lose color
• B. They become brighter
• C. They change shape
• D. They stay the same

Answer: (A)

Sunlight can cause fading of inks and dyes because the ultraviolet energy in sunlight breaks chemical bonds in the color molecules. This photodegradation changes the structure of the dyes so they absorb less visible light, making them look lighter or disappear over time—this is bleaching. With long exposure, the color losses become noticeable and the print or fabric appears faded. This is why colors fade rather than become brighter, stay the same, or change shape. Some colors may shift slightly or fade unevenly, but the overall result of long sun exposure is a loss of color.

Sunlight can cause fading of inks and dyes because the ultraviolet energy in sunlight breaks chemical bonds in the color molecules. This photodegradation changes the structure of the dyes so they absorb less visible light, making them look lighter or disappear over time—this is bleaching. With long exposure, the color losses become noticeable and the print or fabric appears faded.

This is why colors fade rather than become brighter, stay the same, or change shape. Some colors may shift slightly or fade unevenly, but the overall result of long sun exposure is a loss of color.