Gold no better choice
The weight loss (small but measurable) is a result from the cleaning, necessary because stuff from the air will cling to it. As gold is much softer than the used alloy of platinum and iridium, more weight would have been lost.
The weight loss (small but measurable) is a result from the cleaning, necessary because stuff from the air will cling to it. As gold is much softer than the used alloy of platinum and iridium, more weight would have been lost.