cellulose enamel

heres one for the older tyers on the forum

i was reading one of herters books and some fly patterns referenced using “cellulose enamel” (or “celluloid enamel”) on the back of some flies

i did a research on the internet before posting the question here but all i could find was that it was a paint? of some kind. very little info available

so does anybody know what it was or still have an old bottle laying around?

what would be a substitute?

I’m guessing it’s a reference to Veniard’s Cellire: https://www.stoneriveroutfitters.com/fly-tying/fly-tying-materials/veniards-cellire-finish.html. It also comes in colors (black, white, yellow and red at least.)

i found this photo