Replying to [farsha]:chemically Lime is CaO also. that is what I have told to tiger that it can be while.
Further, taken exerpt fom other sites
Citrus aurantifolia (Lime)
Originates from tropical Southeast Asia, where it can still be found wild. Cultivars have been developed based on sweetness (usually sour), size, shape (round or oblong) and colour (yellow or green). All varieties have relatively thin skins. Lime fruit are used for preserves, garnishes and juices. Citral oil is extracted for use in perfumes.
Citrus limon (Lemon)
Hybrid between Citron Citrus medica and Lime Citrus aurantifolia.
The place and date of origin of the Lemon is uncertain but it probably came from China. Lemon is used for making lemonade, it is used in drinks, and for flavouring a wide variety of foods. The essential oil from Lemon is known as cedro oil, and is used as a flavouring in the food industry and is also used in soaps, detergents and perfumes.