Feeding BC on Coffee and Tea

I was after the qualities of growing bacterial cellulose on coffee and that of tea. I was waiting for a nice sheet of BC when I finally uncover the bathtub to find this.

Do you see the edges and the semi sphere. It grows 3 D above the liquid. But why? How? How should it dry to keep these forms. I will try apples next time. My incoming project shall be a dress. I will try to dry this sheet while keeping the effect of the air bubbles.

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