Hi David,
Pure solid gold has a fixed colour, but as to the colour of gold leaf, it’s hugely variable, as mentioned. While reflecting on this I came across a sets of colour charts for gold leaf, not something one would normally think of:
http://www.gildedplanet.com/goldcharts.html
Quite a wide variation in shades available.
For gold leaf, one twenty cent coin (what equivalent size that is in the US I don’t know) will allowing beating out to cover an area of about one tennis court. Extraordinary metal.
Andrew
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