Show NEW WOOD preservative to preserve wood various impregnating agents are used into which the wood is dipped the amount of these preservatives consumed in this manner is considerable A recent development is a new wood preservative which need be used in actually minute quantities only this substance is a mercury derivative an anhydrite of oxy mercuric acid only to 1 per cent of the tive is required to give good results it appears that on exposure to air the wood treated in this way becomes im pre b bated with very powerful insoluble mercury salts which effectively prevent the decay of ithe wood the addition of soda ash and other alkaline salt helps this action along alon b in admixture with such preservatives as copper sulphate e lead acetate and zinc chloride the of the wood is even more complete |