One problem with hide glue is that it can be attacked and degraded by bacteria and fungi.
To protect hide glue from this kind of deterioration I am interested in identifying an effective anti-microbial. Toxicity against beetle larvae would be a plus. Note that hide glue is typically prepared at 140F and so the chemical must be stable at that temperature. Also, any kind of volatility is out of the question because it needs to last for a long time (100 years).
The main chemical I am considering right now is triclosan, but would be interested in any other ideas.