The varnish is formed from the oxidization, or rusting, of the manganese and iron when mixed with oxygen in the air and water from rain; this varnish is dark, almost-black and glossy in appearance.
The varnish is formed from the oxidization, or rusting, of the manganese and iron when mixed with oxygen in the air and water from rain. This varnish is dark and glossy in appearance. This is almost-black.