Experimenting with pre-contact paint

A casual experiment that I decided to film. In which I mix fake ochre with fake sturgeon glue with fake bear grease to make fake authenti-paint.

If I were to try the paint again, I would use less of each base and more water. I also wonder if there are any period feasible emulsifiers to help things blend nicely.

Another idea I had is that maybe the paint could be allowed to harden into a block and then wetted before applying, like watercolour. This would circumvent the congealing issue by letting it congeal beforehand. No idea if that would work.

I see a lot of potential in the idea of the marrow brush, but my design is not very good. I think they should use more end grain rather than the sides, I really should have looked up some pictures beforehand, but laziness.
Here's a real example which should be a lot better. https://collections.rom.on.ca/objects...

Link to patreon if you are so inclined.
https://www.patreon.com/user?u=3998481