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.
One thing that bothers me on the gilding and silvering theory is the fact that in that case pieces must exist with still a decent amounth of bright gold or silver finish on the reverse set up. Sometimes this can be seen on combat awards: the silvering is completely absorbed on the surface of the award but still 100% there on the pin, hinge and catch.