ARMY TM 5-5420-212-23
MARINE CORPS TM 08676A-23/2
2-49. COPPER SULPHATE TEST
This task covers:
Copper sulphate (CuSO4.5H2O) - 20g (9, Appendix C)
Clean water - 1 pint
The copper sulphate test is used to determine the presence of zinc on components. The main
use of this test is for checking that all the zinc coating has been removed from an area to be
Copper sulphate solution is made by dissolving 20g (approximately 3 heaped teaspoons) of
copper sulphate (CuSO4.5H2O) in 1 pint (568 ml) of water. The water may be heated to aid
solution of the crystals, but, if heated, the solution must be allowed to cool before use.
Containers used for mixing the solution must be made of material iInert to copper solution, e.g.
Copper sulphate can be applied to an area by brush or spraying or, if the component is small enough, the
complete component may be immersed into the solution.
When an area is treated with the copper sulphate solution, areas which turn black are the areas which still have a
After testing for zinc coating the solution is to be washed with water and scrubbed off.