I have been using gold and platinum on my glass for years.
I have found that Reusche AKA Hanovia Gold has a tendency to tarnish over time. It does not retain it's shiny gold color after it is fired.
The nice gold color lasts about 2 years.
Don't got me wrong, it still looks great, but is slightly tarnished.Kind of coppery.
Yes, Reusche did get the gold back in stock, but they had to buy large quantity from Germany. So you have to factor in the price of gold and the Euro.