Previously discarded as waste, buried or transformed into animal feed, the fish skin began to attract other interest: its transformation into leather. The tanned skins, from tilapia and frog, are then transformed from waste into valuable products.

The Aguapé tannery choose to work in 100% vegetable process, in which are only used tannins extracted from the bark of trees, in steps of tanning and re-tanning. This type of process results in vegetal leather, also called chrome or metal free. The slightly brownish tone of undyed tilapia leather (in its natural color) is due precisely to the use of tannins that have this color.