Optimisation of laser removal of biological crusts in granites

Díaz, Ana Jesús López; Rivas, T.; Lamas, Javier; Ramil, A.; Yáñez, A.

doi:10.1007/s00339-010-5652-x

Cited by 43 publications

(19 citation statements)

References 9 publications

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“…Finally, in the case of laser‐cleaned sample, the reflectivity of the surface was higher than in the unpainted granite and consequently, CL value was above 1 ( CL = 1.1). Considering that in this case, OM and SEM did not detect graffiti remains on the surface, the increase of reflectivity above the reference granite could be attributed to an alteration of the physical properties of the granitic surface related to the mineral alterations induced by laser ablation and/or associated to an increase of the roughness in the rock surface …”

Section: Resultsmentioning

confidence: 71%

The use of hyperspectral imaging technique to detect the most suitable graffiti‐cleaning procedure

Pozo-António

Ramil

Fiorucci

et al. 2016

Color Research & Application

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Nowadays, graffiti paints are one of the most common human interventions on monuments and historic façades with damaging results. It is an aesthetic problem but also a serious threat to the conservation of built heritage. The aim of this article is to evaluate the suitability of a hyperspectral imaging technique as a nondestructive tool to determine the most adequate method of removing graffiti paints applied on granite rocks. Different cleaning procedures were analyzed; i.e., chemical, mechanical, and laser ablation. The cleaning effectiveness was evaluated based on the degree of paint extraction and the final appearance of the stone surface. The results obtained by hyperspectral technique were compared with those obtained by optical and electronic microscopies and color spectrophotometry. These results indicate the ability of hyperspectral imaging technique to assess the paint removal and thus to evaluate the suitability of the different graffiti cleaning procedures.

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Section: Resultsmentioning

confidence: 71%

The use of hyperspectral imaging technique to detect the most suitable graffiti‐cleaning procedure

Pozo-António

Ramil

Fiorucci

et al. 2016

Color Research & Application

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“…A c c e p t e d M a n u s c r i p t 5 Laser removal of biodeterioration films from stone has been investigated in foregoing studies [19][20][21][22][23]. The action of the Er:YAG laser, operating at 2.94 m, has been tested for the removal of lichens on limestone [20].…”

Section: Page 5 Of 31mentioning

confidence: 98%

“…The action of the Er:YAG laser, operating at 2.94 m, has been tested for the removal of lichens on limestone [20]. Elimination of biological crust from granite was studied using nanosecond laser pulses of 355 nm [21]. In a previous work [22], we have reported on the control of biodeterioration processes induced on dolostone by the lichen species Verrucaria nigrescens using a Q-switched ns Nd:YAG laser at 1064 nm.…”

Section: Page 5 Of 31mentioning

confidence: 99%

Infrared and ultraviolet laser removal of crustose lichens on dolomite heritage stone

Sanz

Oujja

Ascaso

et al. 2015

Applied Surface Science

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“…In this paper, we demonstrate the effectiveness of these methods in a particular case study using some stone artifacts extracted from the Church of Sotterra (Paola, Calabria, Italy). We applied the AFM and PLA methods jointly with the common diagnostic methods (in situ and in laboratory), in order to characterize the materials, identify the pits of their origin, detect the chemical composition of surface patina and define a strategy for the restoration and conservation [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

AFM and pulsed laser ablation methods for Cultural Heritage: application to archeometric analysis of stone artifacts

et al. 2015

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In this paper, we introduce the use of the atomic force microscope (AFM) and of the pulsed laser ablation as methods for morphological diagnostic with nanoscale precision of archeological artifacts and corrosive patina removal from stone artifacts. We test our methodology on stone artifacts extracted from the Church of Sotterra (located in Calabria, South Italy). The AFM microscopy was compared with different petrographic, chemical, optical and morphological analysis methods for identifying the textural characteristics, evaluating the state of preservation and formulating some hypotheses about the provenance and composition of the impurity patina located on the artifact surfaces. We demonstrate that with the nanometric precision obtained with AFM microscopy, it is possible to distinguish the different states of preservation, much better than using conventional petrographic methods. The surface's roughness is evaluated from very small artifact's fragments, reducing the coring at micrometric scale with a minimal damage to the artworks. After the diagnosis, we performed restoration tests using the pulsed laser ablation (PLA) method and compared it with the more common micro-sandblasting under dry conditions. We find that the PLA is highly effective for the removal of the surficial patina, with a control of a few hundreds of nanometers in the cleaning of surface, without introducing chemical or morphological damages to the artifacts. Moreover, PLA can be easily implemented in underwater conditions; this has the great advantage that stone and pottery artifacts for marine archeological sites do not need to be removed from the site.

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Optimisation of laser removal of biological crusts in granites

Cited by 43 publications

References 9 publications

The use of hyperspectral imaging technique to detect the most suitable graffiti‐cleaning procedure

The use of hyperspectral imaging technique to detect the most suitable graffiti‐cleaning procedure

Infrared and ultraviolet laser removal of crustose lichens on dolomite heritage stone

AFM and pulsed laser ablation methods for Cultural Heritage: application to archeometric analysis of stone artifacts

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