The hard granules are basically used for manufacturing durable and hard-wearing items that can withstand the vagaries of weather and the ravages of time.
The tooth patch is a hard-wearing and ultra-flexible material made from hydroxyapatite, the main mineral in tooth enamel, that could also mean an end to sensitive teeth.
It is distinguished by an oiling step, after tanning, where birch oil is worked into the leather to make it particularly hard-wearing, flexible and resistant to water.
Then as now, the benefits of the material are self-evident impermeable and fast-drying (with all seams solutioned and taped), versatile, supple, resilient, crease-proof and smooth, thorn-proof and hard-wearing.
