Development of specialty papers is an art: Dark brown Turkish umber (DBTU) from indigenous raw materials - Part XI

Dark brown Turkish umber (DBTU) paper is a highly specialized paper exclusively used for the manufacturing of expensive decorative laminates. Besides other properties, castor oil penetration, water klemn, wet strength, porosity fire retardancy, see-through, colour, and appearance properties are the most important properties for DBTU paper. Fire retardancy and and DBTU shade is achieved by adding yellow, red, and black oxides of iron in to the pulp furnish. The present paper aims at developing DBTU paper from locally available hard woods like, Eucalyptus tereticornis and Populus deltoides and grass like Bambusa aurandacea from Assam origin.