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Creating a National Trust Paint Sample Archive and Microscopy Centre

Written by
Image of Valentina Risdonne
Valentina RisdonneNational Conservator - Conservation Science, National Trust
A conservation scientist taking a paint sample from the Sir Joshua Reynolds portrait of Lieutenant, later Captain, Paul Henry Ourry, MP (1719-1783) with a young attendant known as 'Jersey' from Saltram House.
A conservation scientist at ROFCS taking a paint sample from a Sir Joshua Reynolds portrait of Lieutenant, later Captain, Paul Henry Ourry, MP (1719-1783) with a young attendant known as 'Jersey' from Saltram House. | © National Trust/Sarah Maisey

We are building a National Trust Paint Sample Archive—a unique resource that combines physical samples with their digital scientific data and reports. This archive will be available to National Trust colleagues, academics, and external researchers, helping them study historic finishes minimising new sampling from fragile objects. Alongside the archive, we are assembling a specialist microscope kit for detailed paint analysis. To host this resource, we are carrying out a light-touch refurbishment of areas in the studio and revamping the visitor engagement space to share information about paint analysis and conservation science.

What is paint analysis?

Paint analysis is the scientific study of paint layers on an object or surface. Conservators use it to understand how something was made, how it has changed over time, and what materials were used. By taking tiny samples and examining them under a microscope, we can:

  • Identify pigments and binders (the ingredients of paint).
  • Reveal hidden layers from earlier designs or restorations.
  • Date and authenticate objects by comparing materials to historical techniques.

What is a paint sample?

A paint sample is a tiny piece of paint taken from an object or surface for scientific study. It usually includes all the layers of paint, from the surface down to the base, so conservators can see the full history of how something was painted.

13 layers of paint over a wood substrate observed under the microscope in a paint sample from Cliveden
Layers of paint over a wood substrate observed under the microscope in a paint sample from Cliveden | © National Trust/Valentina Risdonne

What is Conservation Science?

Conservation science is the study of materials and techniques used in historic objects, buildings, and artworks to understand how they were made and how they change over time. It combines science and heritage: using tools like microscopes, chemical analysis, and imaging to uncover hidden details, identify materials, and monitor deterioration. This knowledge helps conservators make informed decisions about how to preserve and protect cultural heritage for future generations.

Why do we need an archive?

An archive of paint samples is essential for preserving knowledge for the future. Each sample is a unique record of an object’s history—its materials, techniques, and changes over time.

By safeguarding these samples, we create a legacy resource that future researchers and conservators can study, even when the original object is no longer accessible.

The archive allows us to:

  • Protect fragile evidence: Samples are small but irreplaceable; storing them properly ensures they remain available for decades.
  • See the bigger picture: When samples are studied together, they reveal patterns across collections, regions, and time periods.
  • Support the National Trust’s mission: This resource connects individual objects to the wider story of historic interiors and craftsmanship, helping us care for properties in a consistent, informed way.
A large cardboard box containing many boxes of architectural paint samples to be catalogued at the new National Trust Paint Archive, ROFCS, Kent.
Some paint samples to be catalogued at the Paint Archive, ROFCS, Kent. | © National Trust/Valentina Risdonne

Can I engage with the archive?

Yes! Keep an eye on the ROFCS website —we’ll share updates, opportunities to get involved, and guidance on how to request access if you are a researcher, heritage professional, or just have a general interest in colour, interiors and art history. 

Two Conservators rehanging Knight with the Arms of Jean de Daillon by Guillaume Desremaulx at Montacute, Somerset

Preserving the past

From conserving historic works of art and delving into archaeology to supporting urban heritage and parks, find out about our vital conservation work.

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