Why and How Does Construction Paper Fade in Sunlight?

If you've ever noticed that construction paper fades in the sun, you've probably wondered why it happens.

Finding out why and how construction paper fades in sunlight can be explained in a few paragraphs. If you want to delve more into the topic hands on, it is also a good science fair project for elementary and middle school students. This article will explain some background on this scientific occurrence.

Dyes
Construction paper comes in an assortment of colors. Each sheet of paper gets its color from dye during the manufacturing process. The dye causes the paper to fade when it's exposed to the sunlight. The dye in construction paper is not as pronounced from this exposure to sunlight.

Ultraviolet radiation
The dye in construction paper responds to sunlight. If you set a piece of construction paper outside or in the window sill, it will pick up the sun's rays. It undergoes a chemical reaction as the paper absorbs the sun's ultraviolet radiation. Dark construction paper absorbs more sunlight than light construction paper. Dark colors absorb more light because it reflects less light and energy. The lighter color construction paper reflects more of the light and energy. The faded color is also more noticeable in dark colored paper so the damage looks worse.

Lignin
Lignin is a chemical compound that comes from wood. It is found in some paper products. If there is lignin in the paper, it will turn it yellow when exposed to the sun. The yellowing of the paper is caused by oxidation. This contributes to the paper fading that you witness visually.

Prevention/Solution
Paper manufacturers have made some fade-resistant construction paper. This is especially helpful for art projects that you want to last a long time. Hairspray also prevents fading because it blocks the ultraviolet rays. Hairspray is an antioxidant. Many artists use hairspray on paper as a fixative for their artwork and to prevent fading.