The formulation below is to make 10 liters, to make other quantities just keep the proportions between the ingredients. The "bordeaux mixture", calda bordalesa, is made of a dissolution of copper sulphate and lime water.
a) Dissolution of copper sulphate(1 liter):
The day before and four hours before the mixture’s preparation, dissolve the copper sulfate. Pour 100 g of copper sulfate within a cotton cloth, tie and dive into a plastic container with 1 liter of warm water;
b) Lime water:
Pour 100 g of lime in a bucket of 10 liters capacity. Then add 9 liters of water slowly.
c) Mixing of the two ingredients:
Add gradually and always stirring, the copper sulphate solution (1 litre) into the lime water bucket.
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d) Test of the knife:
To see if the final mixture is not acidic, we dive a clean knife made of common steel for 3 minutes in the final mixture.
If the blade is dirty, which means it acquired a brown color when removed from the mixture, indicates that the solution is acidic. It should be added more lime in the mix, but if not dirty, the “bordeaux mixture”(calda bordalesa) is ready to use.
