People wrote poems about it. It is emitted by candles and lightbulbs. At least one person even fights in court when he has the right to bring them out naturally.
It's the smell of laundry detergent.
Some weather chemists love that scent, too. In a paper published this year in Environmental Chemistry, researchers searched for a molecular-level towel, to try to pinpoint their unique scent.
Silvia Pugliese led the research as a student at the University of Copenhagen. When Ms. Pugliese was a baby, her mother washes dry clothes, and she still does whenever she can.
"The new smell reminds me of home," she said. She was then excited to pursue the subject of daily research.
Between their official work of criticism, Ms. Pugliese and two product-teacher, and lataliyehooda Matthew Stanley Johnson, who heads the two places you looga use building kimistar university – office empty, empty and a balcony, a small, fifth floor – and found materials, including water, red and bedding cotton made of Ikea.
Each towel was washed three times with water, and then dried: in the office, under a balcony or in a sunny balcony.
When they arrived at the drying plant, "a lot of friends laughed," Ms. Pugliese. But we got a lot of support.
When the towel finishes drying, the researchers seal the bag for 15 hours. When the towels were in the bag, they sampled the chemical compounds released by the air around them. Investigators made similar samples from an empty backpack, unwashed towel and air around the drying areas.
By comparing the chemical towels of the chemical to that control and each other, the researchers were able to dig out the connective tissue only when they put wet towels in the sun, Ms Pugliese said.
The drying line specifically produced a number of ingredients & # 39; aldehydes & # 39; and & # 39; ketones & # 39 ;: natural nasal molecules in the nose can be identified from plants and perfumes. For example, after sunset, a towel came out pentanal, which is found in the heart, card, octanal, and produces a pleasant aroma, and nonanal, which smells roselike.
Why? Related to ozone exposure, chemicals that can alter the atmosphere of some of the known chemicals & # 39; aldehydes & # 39; and ketones.
More basic contributions, she thinks, can come from the sun itself. When exposed to ultraviolet light, some molecular cells “chew” and form highly reactive compounds, called M. Pugliese said. The radicals then interact with other nearby molecules, activities that lead to the formation of aldehydes as well as ketones.
It is possible that the water in a wet towel collects a lot of the molecules in the model, and then acts "like a magnifying glass," combining sunlight and speeding up that reaction, Ms. Pugliese said.
Similar activities may occur in any number outside the natural landscape, including the empty soil and individual flowers of the grass – perhaps part of the reason why after the rain makes the world a new one. (While the fragrance appears to be longer in the garment, aldehydes may also attach to cotton, Ms. Pugliese says.)
Ricardo López, a pharmacist at the Lab for Flavor Analysis and Enology at Zaragoza University in Spain who is not involved in research, thinks aldehydes and ketones may not tell the whole story.
"When testing the compounds that taste important, sometimes small compounds are more important for those that are more concentrated," he said. More types of experiments may help to find the perfect bouquet.
Ms. Pugliese, for now, has done some good things – Her undergraduate research involves a non-traditional photographer – but she hopes to make the points for her in the future.
I thought it was a great way to do science, she said.