Ecox is a pickling salt in powder. Once melted in warm water it forms a solution having a deoxidizing and clearing action from flux residual on the cast and/or soldered metal frames. It is particularly effective moreover in the removal of copper oxides from alloys for resin with gold and silver prevalence. The acidity of the Ecox solution must be neutralized adding the necessary quantity of Neutrox. The neutralization will be indicated from the colour change of the solution, from initial reddish to a yellow coloration.