Using a wood frame, Kombucha and Copper build a Speaker. Project by Jean Marie Durney

the idea is to put the copper between to layer of Kombucha before it dry.

I used a wood frame coming from a broken IKEA clock found in the street. I applied the first layer of Kombucha with a little bit of tension, then let it dry. After 4 hours I put the copper frame cut with vinyl cutter.2 wires soldered to the ends of the copper stirale. Then I applied another layer of kombucha and let it dry in front of a fan.

More on https://wikifactory.com/+sdgsolutionspace/kombucha-speaker