Something else burning up the heat index, an experiment about makeup. How men and women perceive other women who wear makeup. Reporter: They say beauty is old skin deep. Nearly half of American women... See More
Something else burning up the heat index, an experiment about makeup. How men and women perceive other women who wear makeup. Reporter: They say beauty is old skin deep. Nearly half of American women admit they wouldn't be caught dead without a little makeup on. We feel more confident. We exudes confidence. Reporter: The amount of makeup you packed on your face increase the way you're perceived by others. This college student decided to find out. Conducting a one-week cosmetic experiment, using hers as the Guinea pig, wearing makeup, light makeup and then a full face. Then she posted her results online. Day one, no makeup, her boyfriend thought she had fallen ill as did so many others. I got so comments saying you look like you had a long day. Reporter: Light makeup. No guys made any comments about my appearance. Reporter: On the last day of her experiment, with full makeup, she was bombarded with praise. I had a guy if I was going out that night because it looked like I was ready to party. Reporter: The truth is, this is how I normally spend my days. Only when I come to work when I layer on the war paint and this is me after. What impact does wearing makeup on just the wearer but on the perceiver. When we wear makeup, we feel more confident and what happens is, we come across as more credible. Reporter: She said that her experiment has changed the definition of beauty. For "Good morning America," juju Chang, ABC news, New York.
This transcript has been automatically generated and may not be 100% accurate.