be pumped out until to a predetermined pressure is acquired the first buffering chamber 3 is opened the substrate is transferred to the first buffering chamber 3 the first buffering chamber 3 is closed to separate the first pumping chamber 2 and the depositing chamber 4 i e the first buffering chamber 3 acts as a barrier between the first pumping chamber 2 and the depositing chamber 4 to prevent the air inside the first pumping chamber 2 from entering into the depositing chamber 4 the substrate is successively entered into the vacuum chambers 4 a 4 b 4 c to deposit the coating on the substrate for simplicity the means for moving the substrate through the various chambers is not shown the coating may include a bonding layer a protection layer and a color layer successively deposited on the substrate the bonding layer may be a zirconium layer deposited in the vacuum chamber 4 a the protection layer may be a zirconium carbon oxide layer deposited in the vacuum chamber 4 b the color layer may be a titanium nitride carbon layer deposited in the vacuum chamber 4 c during depositing the bonding layer on the substrate the temperature in the vacuum chamber 4 a is set between about 130 degrees celsius u00b0 c and about 170 u00b0 c pure argon is floated into the vacuum chamber 4 a at a flux between about 450 standard cubic centimeters per minute sccm and about 550 sccm a zirconium target in the vacuum chamber 4 a is evaporated at a power between about 100 amps and about 500 amps for between.