1 week after the test, since, for example, the test lab with methods which it displays nickel concentrations in aqueous solution: surface area of a test specimen according to EN1811.
After the first week of the test sample and experiment with different methods. It shows the concentration of nickel in solution, the surface area of the sample. By the standards of EN1811
Test after 1 weeks from the test sample experiments with various methods It is shown in the solution concentration of nickel on the surface area of the test sample. According to the standard of EN1811.