This tip for creating glass substrate circuit boards at home might hew a bit closer to arts and crafts than the traditional Hackaday post, but the final results of the method demonstrated by ...

To degrade the substrate, the researchers placed it in an ultrasonic acid bath to remove the metals and circuit components. The boards began to degrade after about a month in compost.

Printed circuit boards have never been cheaper or easier ... One color, the fiberglass substrate, will be a pale yellow. The copper layer will be silver or gold, depending on the finish.