The electrotest on food cans is a method used to determine the porosity in internal coatings of cans, especially those with an internal coating and is not applicable to bare cans, cans with aluminum internal coating or cans with zinc carbonate gold varnish. The procedure involves cutting the flange of the can, filling it with an Electrotest solution to a specified height, applying a specified voltage through a porosity analyzer, and measuring the current intensity flowing through any discontinuities in the coating. The result of the measured current intensity is used to calculate the current density, which is related to the porosity of the coating. This process helps to ensure the quality and safety of the cans for use in food preservation.
There are also other more homemade equipment where with a power supply and a current flow adjusted to a correct voltage, and immersing the caps or bodies of containers in the specific solution of copper sulfate, oxidizes immediately any spot with pores or scratches of varnish.
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