hexamethylenetetramine

Most of my assignments were pretty mundane, like making super pure hexamethylenetetramine to be used for making the explosive cyclonite.

William S. Knowles - Autobiography 2002

Specimens preserved in formaldehyde can be protected in the long term by adding hexamethylenetetramine (otherwise known as hexamine, the product of ammonia and formaldehyde) to the liquid.

Practical Taxidermy A manual of instruction to the amateur in collecting, preserving, and setting up natural history specimens of all kinds. To which is added a chapter upon the pictorial arrangement of museums. With additional instructions in modelling and artistic taxidermy. Montagu Browne