Copper corrosion
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Excuse me, when measuring the corrosion of copper sheets, what do 0-5 correspond to? I know that 0 means no corrosion and 5 means severe corrosion. What about the others?
Divide according to standards (color comparison method): 1 Mild 2 Moderate 3 Deep 4 Corrosion
During the test, the surface of the copper sheet is corroded by the model to be tested. The degree of corrosion is divided into four levels.； 1: Mild discoloration ---------- light orange, almost the same as new copper pieces ； dark orange 2: Moderate discoloration------------- purple-red ； light red ； Multicolored with lilac or silver, or both, overlaid on fuchsia ； silver ； Brass or golden yellow 3: Deep Discoloration--------------Magenta overlaid on brassy multicolor ； Multicolor with red and green display (malachite green), but without gray 4 corrosion ----------- transparent black, dark gray or brown with only malachite green ； Graphite black or matte black ； glossy black or jet black shiny black