We had a cracking time.

The determination of the glucosidal or non-glucosidal nature of a tannin is sometimes a matter of considerable difficulty, because, on the one hand, it is not always easily separated from any glucose with which it may be contaminated, and, on the other hand, many tannins readily decompose, yielding bodies resembling their mother substances in possessing a similar action on hide, gelatine, etc.

2007, Escobar, Martha L.; Derrick, Brian, “Long-Term Potentiation and Depression as Putative Mechanisms for Memory Formation”, in Bermúdez-Rattoni, Federico, editor, Neural Plasticity and Memory, CRC Press, retrieved 2009-12-05:

In a treatise that still causes ripples in English society, Mitford defined various terms as either U (upper class) or non-U.