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This page was last edited on 20 November 2024, at 18:43 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Bogala Graphite Mine (Sinhala: බොගල ග්රැෆයිට් පතල) is a graphite mine located near the village of Aruggammana in Kegalle District, Sabaragamuwa Province. It is one of the largest graphite mines in Sri Lanka, with commercial mining at this location first commencing in 1847.
Graphite mining in Sri Lanka has occurred since the Dutch occupation of the country. It is the only country in the world to produce the purest form of graphite, vein graphite (also known as lump graphite), in commercial quantities, currently accounts for less than 1% of the world graphite production.
Kahatagaha Graphite Mine (Sinhala: කහටගහ මිනිරන් පතල Kahatagaha Miniran Pathala) is a graphite mine located in the village of Kahatagaha in Dodangaslanda in Kurunegala District, North Western Province. It is one of the largest mines in Sri Lanka.
Two graphite pencils. Both are labelled "HB", but the numeric label differs between "2" and "2 1 ⁄ 2 ". A grading chart ranging from 9B to 9H. Graphite pencils are made of a mixture of clay and graphite and their darkness varies from black to light grey. A higher amount of clay added to the pencil makes it harder, leaving lighter marks.
A copying pencil, also an indelible pencil or chemical pencil, [1] is a pencil whose lead contains a dye. The lead is fabricated by adding a dry water-soluble permanent dye to powdered graphite —used in standard graphite pencils—before binding the mixture with clay .