But the stock material can have different colors.
Just depends on what the coin suffered during its like.
But the quarter as mentioned before, is a
Grease Fill issue, preventing devices to show on a coin. A question on the back of everyones mind is this:
How can grease prevent metal from forming a device? Because the grease what in the die first, it prevents that device from forming. Just like a hydraulic jack can lift a lot of weight, the pressure on the coin forces the jack to lift the desired object. The oil was there first. When pressured by the jack, it lift the object because of the pressure on the piston in the chamber. Thus grease prevents the contained area to be formed.