Worldover crisis of wood is being felt due to the global environmental problems. Wood preservation technology plays a good role in curtailing the demands of wood for replacement by prolonging the service life of the timber and thus indirectly helps in saving the environment. Some species of timbers which could not be treated to the desired level by virtue of their refractory nature by any of the conventional preservatives CCA, CCB, ACC etc. even by pressure method fail to give longer service life. An attempt was made in Forest Research Institute (India) to treat such species with ammoniacal copper arsenite solution by simple soak treatment. This ensures good penetration (5-8 mm) and adequate absorption (10 kg/m³) in the treatment heartwood zones, of Eucalyptus and Prosopis sp. These two species have been planted in large quantities but have not found suitable use due to their nondurable nature and refractoriness to treatment. This development will help in utilisation of this resource for better purposed ensuring good return to the formers.

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