Mechanical and laser cleaning of spray graffiti paints on a granite subjected to a SO 2 -rich atmosphere

Vera Gomes, Amélia Dionísio, J. Santiago Pozo-Antonio, Teresa Rivas, Alberto Ramil

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Cleaning effectiveness of four graffiti spray paints artificially aged by SO 2 exposure on granite was evaluated. Two different removal procedures were applied: i) mechanical methods with different micro abrasives (Hydrogommage® – combining action of air, water and micro abrasive-silica or aluminium silicate and IBIX® – combining action of air and micro abrasive-silica or calcium carbonate), and ii) a ns Nd:YVO 4 laser working at 355 nm. It was concluded that the cleaning with mechanical procedures and laser was influenced by the SO 2 exposure. Aged samples were more difficult to clean, suffering higher global colour changes. Hydrogommage® with silica abrasive achieved the best results, due to a combination of a satisfactory paint extraction and low morphological damages induced to the granite.

Original languageEnglish
Pages (from-to)621-632
Number of pages12
JournalConstruction and Building Materials
Publication statusPublished - 10 Nov 2018


  • Cleaning effectiveness
  • Cultural heritage
  • Granite
  • Laser cleaning
  • Mechanical cleaning
  • SO ageing
  • Spray graffiti paints


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