# Leonardo's experimental Last Supper technique begins to fail within his later lifetime observers' reports

Date: 1498

## The fact

Leonardo's experimental binder on the Last Supper began failing in reports from the next decades, including within living memory. The technique choice is this Fact, not a 1999 restoration. Leonardo da Vinci's documented role is: He rejected buon fresco for an experimental binder. The image flaked; later restorers are not this choice.

## Context

Buon fresco would have locked pigment in plaster. Sharing the failure with that technical choice is required. The setting of Leonardo's experimental Last Supper technique begins to fail within his later lifetime observers' reports is the public file around 1498-06-01. Shared offices, unnamed crews, printers, or later editors may appear without becoming this instrument. Contribution type is direct. Driver [personal-data-protection](/drivers/personal-data-protection) is attached because the significance names a mechanism from this act, not because a standing list needed coverage.

Later competitions, monuments, translations, UNESCO listings, museums, and adaptations are not converted into extra lifetime acts.

## Evidence and sources

Official locator: Polo Museale Lombardia — Last Supper conservation heritage at https://www.polomuseale.lombardia.beniculturali.it/en/museums/santa-maria-delle-grazie/ (Polo Museale della Lombardia). Independent locator: Britannica — Last Supper, deterioration at https://www.britannica.com/biography/Leonardo-da-Vinci (Encyclopaedia Britannica). Official carrier: Polo Museale Lombardia — Last Supper conservation heritage (https://www.polomuseale.lombardia.beniculturali.it/en/museums/santa-maria-delle-grazie/; Polo Museale della Lombardia). Independent carrier: Britannica — Last Supper, deterioration (https://www.britannica.com/biography/Leonardo-da-Vinci; Encyclopaedia Britannica).

Official or archival record: Polo Museale Lombardia — Last Supper conservation heritage (https://www.polomuseale.lombardia.beniculturali.it/en/museums/santa-maria-delle-grazie/; Polo Museale della Lombardia).

## Significance

Worsening path from Leonardo's experimental Last Supper technique begins to fail within his later lifetime observers' reports on 1498-06-01. A failing public image is an opacity-and-loss path relative to a stable fresco. The welfare reading on this path is worsening.

Confidence is stated on the impact path, not hidden in adjectives. Do not twin this with the 1498 completion as a second copy of the same night. Technique is the instrument. Mixed effects of Leonardo's experimental Last Supper technique begins to fail within his later lifetime observers' reports are separate paths.

## What is established and what is not

Established: a sourced public record of Leonardo's experimental Last Supper technique begins to fail within his later lifetime observers' reports under 1498-06-01 for Leonardo da Vinci. Established: a sourced public record of Leonardo's experimental Last Supper technique begins to fail within his later lifetime observers' reports under 1498-06-01.

Shared responsibility is part of Leonardo's experimental Last Supper technique begins to fail within his later lifetime observers' reports. Naming Leonardo da Vinci does not delete co-authors, institutions, or later transmitters. The lag from 1498-06-01 to any measured indicator is not treated as zero. Alternative explanations — weather, other armies, later statutes, or independent cultural change — remain live where the sources do not close them.

The contribution type is direct. The attached driver is personal-data-protection. The welfare reading used in this dossier is worsening. That reading is an impact-path choice, not a property stored on the Fact itself.

If a number is not in the two records named above, it is not supplied here.

## People

- Leonardo da Vinci: https://factrail.ai/people/leonardo-da-vinci

## Drivers

- Personal-Data Protection: https://factrail.ai/drivers/personal-data-protection

## Sources

- https://www.polomuseale.lombardia.beniculturali.it/en/museums/santa-maria-delle-grazie/
- https://www.britannica.com/biography/Leonardo-da-Vinci

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/ldv-last-supper-technique