Hologram, thanks for mentiong the 'quecksilberschlieren', I guess my suspicion was correct.
Lionel, thanks for the encouragement and the picture. We're getting a pretty good collection of Lippmann images on this thread.
Quick question; any recommendations (I'm looking at you Hologram ) on substituting Sorbitol for Glycerin?
[update, two hours later... whoa, I get it! "quecksilber" is quicksilver, and schlieren is streak, as in Schlieren photography which captures fluid movements of air by small variations in density, streaks if you will. I love cognates and borrowed words...]