It was seen that increasing the 
amount of additional element increased the tarnish 
resistance for testing times from 15-120 min. For 
prolonged testing time at 180 min, nearly all the 
samples show a tarnished, dark-brown surface 
color. The sterling silver alloy containing with the 
highest percentage of Si at 0.3wt% showed the best 
tarnish resistance of all the composition