How to harden a 'rubber bone'?

A few weeks ago I was digging a new garden and I uncovered an old beef rib bone buried next to a rusty tin can. I presume one of my dogs put them there several years ago. The bone had developed a nice patina, infused with a reddish-brown color, most likely from the rusty can.
It would work perfectly as scales (handles) for an old hunting knife of mine if I could flatten it out somewhat. 
Remembering an old trick from my youth, I have been soaking it in white vinegar and it has softened nicely without losing the patina. From my past experience I know it will re-harden if I allow it to dry out, but it will be more porous and brittle.
My thought was to dry it then coat it liberally with super glue or to soak it in a clear acrylic paint for several days to fill the pores.
I am looking for any ideas or suggestions that will help me in this project, whether they be ways to make my ideas better or something entirely different.
Thanks.



You can use a product called Paleo Bond. It is used to stabilize, harden, and fill cracks in bone and fossilized materials. You can purchase it online from several sources, but I get mine here: http://www.texasknife.com/vcom/product_info.php?cPath=223_41_901&products_id=2304
Burf (author)  diyoutdoorsman6 years ago
Thank you, sir.
Something like that was precisely what I was looking for.