Y.A. MARUTHI, N. LAKSHMANA DAS AND S. RAMPRASAD
Abstract
Most of chalks producing in India are of poor quality and dusty black board chalks. Good quality and dustless black board chalks are importing from Europe, China, Taiwan and United States of America. The essential factors required for chalks are lacking in the chalks. Investigations of the factors that indicate the quality of chalks were determined based on Indian standard institute certification standards for school chalk.