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CAPuS project and the European challenge to conserve Street Art: characterization of painting materials and degradation of the pictorial layer


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CAPuS project and the European challenge to conserve Street Art:

characterization of painting materials and degradation of the pictorial layer

Moira Bertasa a, Chiara Ricci b, Tommaso Poli a, Monica Gulmini a, Paola Croveri b, Arianna Scarcella b, Dominique Scalarone a

(a) Department of Chemistry, University of Turin, Via Pietro Giuria 7, Turin, Italy

(b) Fondazione Centro Conservazione e Restauro La Venaria Reale, Via XX Settembre 18, Venaria Reale, Italy




Bruges, 7 – 10 May 2019 -Saint John's Hospital (Oud Sint-Jan) Conservation of Art in Public Spaces (CAPuS) is an Erasmus + Knowledge Alliances

Project, where a strong alliance between manufacturers, restorers, universities and

research centers has been established to effectively contribute to the conservation of

urban art. Artists have also been involved through structured interviews. The two main goals of the CAPuS project are:

➢ the development of guidelines for the protection and the conservation of urban art ➢ the introduction of an innovative training module in higher education institutions

SUPPORT Concrete - Plaster - Bricks - Metal - Wood

PAINTED LAYER Binder Alkyd S, B* Acrylic S, B Styrene acrylic S, B PVA/VeoVa S, B PVA B Nitrocellulose B Pigments

Inorganic pigments & fillers

(talc, kaolin and other silicates, calcite, Ti

white, quartz, barite, dolomite, Prussian blue, Zn white)

Organic pigments

(Hansa Yellow, Permanent Yellow, PY74, PR84, Cinquasia Violet) PROTECTIVE LAYER Acrylic Resin Styrene acrylic

WP3, WP4 – Analytical characterisation


Il Bosco Elisabetta Viarengo Miniotti No Title Various artists

WP3, WP4 – Aging tests of selected products


Alkyd resin and PY74

We Love Enak

Various atists

Styrene acrylic + PVA/VeoVA








Since the ‘90s, Turin has become a particularly active and prolific city in the urban art scene hosting several street art festivals and other initiatives of urban art (i.e. the MurArte project, PicTurin - Turin Mural Art Festival, the international call B.ART) which led to the realization of more than 80 murals. To these works are added those present in MAU, an outdoor urban art museum, which

Aging tests




currently hosts 147 works of public art by 96 artists.

1. Selection of 13 artworks

2. Interviews to artists

3. Identification of constituent materials

4. Composition & stability of paints and spray colours

5. Study of paint-support interface phenomena

The main aim of this part of the CAPuS project is to understand and outline the variability of materials used in Urban Art and to investigate their stability also in relation to the kind of support (i.e. plaster, brick, concrete, metal, wood) and to the interactions with the outdoor environment.

* S = spray painting; B = brush painting

SUPPORT Concrete - Plaster - Bricks - Glass slides

PRIMER Montana Colors - Sikkens

P AINT LA YE R Spray painting Montana Gold R - MG - B* Montana 94 R - MG - B Molotow Belton R - MG - B Brush painting Sikkens AlphaAcrilmat R - MG - B - W Sikkens Fullfarbe B - W

In the next months model samples will be aged naturally and under accelerated outdoor conditions, and their mechanical integrity, chemical, colour and surface changes will be monitored over time.

* R = red; MG = military green; B = black; W = white




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