possibly of interest in the context of this thread, are comments in the glossary of Leslie Jackson's book 'Whitefriars Glass'.
Under the heading of gold foil she says.............
"Initially gold foil was used in the main body as well as in the stems and knops. (pl. 35ii) Later the technique was largely confined to the stems and knops of goblets, continuing until the 1930's. (pl. 76) Platinum foil and mica scales were used in a similar wa, but are much less common."
The word leaf is not used - implying that it wasn't real gold that was being referred to.
