Kombucha bacterial cellulose

The bacterial cellulose (SCOBY) is formed as a sheet in a vat of kombucha brew. After fermentation, the sheet grows up to 30mm thick, and is then removed from the vat. It then goes through an alkaline cleaning process: first rinsed in ethanol, then soaked overnight in a vat of alkaline solution (Sodium Bicarbonate + Water). It is then taken out to be laid flat on a horizontal piece of wood, covered by a linen and then by a sheet of acrylic. It is left under direct sunlight to dry over a day. A coating of Sodium Alginate solution is thinly applied over the sheet and then left to dry.