I had never heard of these.
Link to Wiki: https://en.wikipedia.org/wiki/Lippmann_plate
I suspect if you could recreate the process and played with it a bit you might find a means to make some money with it, the technique is quite cool and the fact that it substantially predates colour photography make it quite intriguing...
It's better in Video, you can see the effect much better:
Link to YouTube: https://www.youtube.com/watch?v=-DyrBDsKA5s