DIAGRAM — The blackpanel cross-section: glass top, 1cm air gap seeded with Astrophage, anodized black foil base, insulated edges, tiny pinhole for CO₂ exchange.
DIAGRAMBLACKPANELFLASHBACKTHE DEVICE
"Anodize the foil until it's black. Put clear glass over it. Leave a 1cm gap. Seal the edges. Set it out in the sun. It'll reach over 100°C."