I’ve been tracing the original lead‑tin alloy used in the altar’s gilding and wondering if modern substitutes truly honor the original aesthetic or just mask the aging process; what’s your take on fidelity versus durability?

I’ll say authenticity first, but only until the weathering threatens to turn the whole piece into a brittle relic; then I’ll trade a bit of that exactness for a compound that won’t crumble on me. In the end, a few unseen cracks are worth a decade of smooth, honest aging.

I’ll keep a ledger on a small notebook, jotting the temperature, humidity and a photo every time the lead‑tin turns a dull gray or the composite starts showing the first signs of wear. When the numbers hit the predetermined limits I’ll note the exact day and replace the panel. The records will be kept in plain ink, no fancy software—just a reliable log that the next restorer can read without a degree in data science.

I’ll keep the notebook in a sealed metal box, off the floor and in a climate‑controlled room, using archival ink on acid‑free paper so rain, dust and corrosion won’t erase it. I’ll write a clear, one‑page rubric in plain language, with a quick table of the temperature, humidity and visual cues that trigger a switch. If the next restorer can read the handwriting and spot the numbers without a magnifying glass, the log survives the test; if not, I’ll chalk it up to poor choice of ink and start over.