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La pulitura laser di vernici sintetiche su una tavolozza acrilico-vinilica: rimozione, resistenza e alterazioni


Anno: 2014

in: APLAR 5, Applicazioni laser nel restauro, Musei Vaticani 18-20 settembre 2014

a cura di: A. Brunetto


The vinyl-acrylic emulsion paints are an important part of the artistic heritage from the second half of the twentieth century. Due to their sensitivity to organic solvents, useful for the removal of varnish and paint retouching, in the present work the feasibility of selective cleaning by laser has been proven.

Most laser instruments available on the market have been employed, such as Er:YAG (λ 2940 nm) and Nd:YAG (λ 1064 nm) at different performances: FR (60-120 μs), LQS (100 ns), QS (6-8 ns).

A palette sample of 11 vinyl colors (Polycolor – Maimeri), partly treated with 2 varnish, the acrylic Surfin by Lefranc et Bourgeois and the hydrocarbon Regarlez 1094, was irradiated. The target was to assess the level of risk and ablation threshold of various pictorial films and the ability to remove varnish and the paint without damaging the substrate. The results, macroscopically and microscopically observed in diffused, raking and UV light, suggest a prudent application of these lasers at high fluences.