Copper salts, borax and boric acid
individually provide good to excellent
protection to wood against fungal and insect
attack. A new formulation has been
developed at the Forest Research Institute,
Chittagong, Bangladesh with borax, boric
acid and copper sulphate (BBC) in
mixture. Immediate precipitation of copper
borate occurs when borax is added to a
clear solution of copper sulphate and boric
acid in mixture. The precipitate dissolves
in ammonium hydroxide and an intense
blue solution is obtained. On vaporization
of ammonia from the solution copper
borate is reprecipitated.