More on “limestone paste”
Voice of The Reader

More on “limestone paste”

May 19, 2017


The Karnataka State Food Safety Commissioner has banned, inter alia, the sale of “limestone paste” which is used in the preparation of paan beeda in packets and tubes (SOM dated May 16). I am afraid,  there has been some mix-up in the nomenclature.

The mineral, calcium carbonate, occurs in several forms: Limestone, Chalk, Calcite, Marble, etc. Limestone is almost insoluble in water.  A  “limestone paste” is, therefore,  impossible.

Limestone, on heating, yields quicklime (calcium oxide). This quicklime further reacts violently with water and yields slaked lime (calcium hydroxide) — a white amorphous powder. However, slaked lime is very sparingly soluble in water, resulting in a white paste. It is this ‘lime-paste’ which is used in the preparation of paan beeda.

PS: A suspension of slaked lime in water is known as milk of lime.  It is used as a coating for the brick and mortar walls of buildings. The coating serves as a weather-coat. However, on prolonged exposure to atmosphere, the slaked lime (calcium hydroxide) reacts with carbon dioxide and water present  in the air to form calcium carbonate. The carbonate gets peeled off as flakes.

– K.N. Krishna Prasad on e-mail, Lakshmipuram, 17.5.2017


Mysuru’s favorite and largest circulated English evening daily has kept the citizens of Mysuru informed and entertained since 1978. Over the past 41 years, Star of Mysore has been the newspaper that Mysureans reach for every evening to know about the happenings in Mysuru city. The newspaper has feature rich articles and dedicated pages targeted at readers across the demographic spectrum of Mysuru city. With a readership of over 2,50,000 Star of Mysore has been the best connection between it’s readers and their leaders; between advertisers and customers; between Mysuru and Mysureans.


Academy News Papers Private Limited, Publishers, Star of Mysore & Mysuru Mithra, 15-C, Industrial ‘A’ Layout, Bannimantap, Mysuru-570015. Phone no. – 0821 249 6520

To advertise on Star of Mysore, email us at

Online Edition: [email protected]
Print Editon: [email protected]
For News/Press Release: [email protected]