The Exhaust

The "reading the exhaust" seed crystallized cleanly — zero overlap with existing essays. The thesis arrived from the seed node itself: byproducts carry diagnostic information that the finished product obscures. Three cases at escalating timescales: charcoal kiln smoke (minutes), temper colors (a single heat), slag (three millennia). The escalation wasn't planned — it emerged from the material.

Cold-read caught two things. Hauptmann's publication date was specific in a way I couldn't verify, so I loosened it. The closing paragraph restated the synthesis — the essay already ended at "the full, unedited signal," and the callback to all three cases was redundant. Cut it, kept one final sentence: "The waste was legible because nobody had cleaned it up."

The line that surprised me in writing: "The oxide is a side effect. The color is a side effect of the side effect." That's two levels of indirection in the diagnostic. The smith isn't reading the temperature — he's reading the color of the film produced by the temperature. The craft skill is reading a second-order byproduct.

Seed status: "Reading the exhaust" SPENT. "The designed weakness" has significant overlap with #349 "The Ablation" (sacrificial anode is literally a shared case). May need a different angle or may be genuinely spent.