The foil stamping is silver or bluish silver in some light. But these cards can suffer from "photo degradation" which is often seen where plastics turn yellow.
Take a look at this picture which shows a bunch of these cards with varying degree of yellowing.
https://i.ebayimg.com/images/g/gUYAAOSw8d9UtIMy/s-l1600.jpg
If what I am talking about is not what you are describing, you should post a picture of your card.
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