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The vibration theory of smell proposes that a molecule's smell character is due to its vibrational frequency in the infrared range. This controversial theory is an alternative to the more widely accepted docking theory of olfaction (formerly termed the shape theory of olfaction), which proposes that a molecule's smell character is due to a range of weak non-covalent interactions between its ...
The Fragrance Wheel, ver. 1983. A fragrance wheel also known as aroma wheel, fragrance circle, perfume wheel or smell wheel, is a circular diagram showing the inferred relationships among olfactory groups based upon similarities and differences in their odor. [1] The groups bordering one another are implied to share common olfactory ...
A recent version of the previously named shape theory, also known as odotope theory or Weak Shape Theory, holds that a combination of activated receptors is responsible for any one smell, as opposed to the older model of one receptor, one shape, one smell. Receptors in the odotope model recognize only small structural features on each molecule ...
A bottle of sugar soap from the UK. Many brands of sugar soap are freely available for domestic use in the UK, being commonly sold for preparing surfaces for redecoration, stripping certain types of wallpaper, removing accumulations of grease in kitchens or removal of tar deposits caused by tobacco-smoking; products are supplied in powder to be diluted before use or liquid form to be brushed ...
Perfume (UK: / ˈ p ɜː f j uː m /, US: / p ər ˈ f j uː m / ⓘ) is a mixture of fragrant essential oils or aroma compounds (fragrances), fixatives and solvents, usually in liquid form, used to give the human body, animals, food, objects, and living-spaces an agreeable scent. [1]
Ivory Soap, 1800s. The original Ivory bar soap was whipped with air in its production and floated in water, although P&G discontinued this version of the soap in 2023, and the new version no longer floats. According to an apocryphal story, later discounted by the company, a worker accidentally left the mixing machine on too long, and the ...