Nonculinary uses
Aromatherapy, first aid and medicine
In one of the most comprehensive scientific investigations done yet, researchers at The Ohio State University revealed lemon oil aroma used in aromatherapy does not influence the human immune system, but may enhance mood.[17]
The low pH of juice makes it antibacterial.
Commercial use
Lemons were the primary commercial source of citric acid prior to the development of fermentation-based processes.
A halved lemon is used as a finger moistener for those counting large amounts of bills, such as tellers and cashiers.
Household use
The peel oil is used as a wood cleaner and polish, where the solvent property of d-limonene is employed to dissolve old wax, fingerprints, and grime.
A halved lemon dipped in salt or baking powder can be used to brighten copper cookware. The acid dissolves the tarnish and the abrasives assist the cleaning.
As a sanitary kitchen deodorizer the juice can deodorize, remove grease, bleach stains, and disinfect; when mixed with baking soda, it can remove stains from plastic food storage containers.[18]
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