No, this is not correct when it comes to genuine zinc/painted badges. The yellow color is in fact normal white paint that has either:Hi Wim,
One can also, as already mentioned poorly made Gaussieger 1944 discover overpainted yellow color.
- Been covered with Zaponlack/Firnis - Clear varnish
- Faded over time.
I clearly showed this with microscope images of the white/yellow paint (on zinc badges) in the last book i wrote.
What might also contribute to white turning a different color is the coating process. "Galvanisch-versilberung/vergoldung" may also have reacted with the paint, as is also discussed and shown in the PB book.