At the natural glues one can distinguish between:
- skin Glue: the slowest drying glue, is gelatinous
- Nerve Glue: gives a very good adhesion, does not dry as fast as bone glue
- bone Glue: is very strong and is very fast hard
- rabbit Glue: dries slow Isinglass: made of skins and bones of the sturgeon
The natural adhesives have the disadvantage that they increasingly moisture sensitive and that the accounting treatment is more difficult than for example a cellulose or epoxy glue. The advantage is that they have proven their reliability in the restoration.