A new portable device patented the 24/12/14 is exposed for the analyses of painting materials.

We miniaturize a spectrofluorimeter for the in‐ situ analyses of fragile artworks using LED UV sources.

Fluorescence emission spectra were compared with the portable and benchtop devices and showed a good matching between them.

We constitute a database of fluorescence emission spectra of some medieval pigments and binders.

The LEDμSF presents many advantages: its lightweight, easy to use, short time of analysis.