Superficial and Shroud-like coloration of linen by short laser pulses in the vacuum ultraviolet

Lazzaro, P. Di; Murra, D.; Nichelatti, E.; Santoni, A.; Baldacchini, G.

doi:10.1364/ao.51.008567

Cited by 16 publications

(20 citation statements)

References 24 publications

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“…The partial inhibition of fluorescence induced by both UV and VUV laser radiation shown in [8,10,11] is an additional feature of our coloration similar to the TS image.…”

Section: Excimer Laser Coloration Vs Turin Shroud Colorationmentioning

confidence: 55%

“…In this 00005-p.3 respect, our experiments were successful, as we obtained a permanent coloration of the outside fibres of the linen threads [8], and using a particular set of irradiation parameters we obtained a coloration limited to the primary cell wall of the linen fibres [8,11], that is, a coloration superficial at the fibre level similar to that of the TS [5], see Fig. 2.…”

Section: Arf Excimer Lasers Irradiationsmentioning

confidence: 62%

“…In addition, we observed the hue of yellow colour slowly changes with the number of consecutive laser pulses, thus allowing an accurate control of the RGB value within 2% by selecting the total irradiation fluence/intensity [11], e.g., by varying the number of laser pulses.…”

Section: Shs Web Of Conferencesmentioning

confidence: 94%

“…the colour is obtained only when the laser fluence/intensity on the linen is above a given level. However, after laser irradiations just below-threshold that at first do not generate a visible coloration of linen, a latent coloration appears either by artificial or natural aging of linen, as detailed in [8,10,11]. Latent coloration is interesting for the synergy between radiation and the oxidative-dehydrating effect of aging which trigger the coloration process, and for historians, attracted by the possibility that, whatever has caused the TS image, the coloration may have "developed" over time.…”

Section: Excimer Laser Coloration Vs Turin Shroud Colorationmentioning

confidence: 99%

“…Latent coloration is interesting for the synergy between radiation and the oxidative-dehydrating effect of aging which trigger the coloration process, and for historians, attracted by the possibility that, whatever has caused the TS image, the coloration may have "developed" over time. Latent coloration can be explained by oxidation and dehydration of the cellulose (caused by heat or by natural aging) amending the new chemical bonds induced by laser irradiation, thus facilitating the formation of conjugated unsaturated structures that are essential part of the photochemical reactions involved, as detailed in [11]. The synergy between heat and UV light on cellulose is discussed in [12], showing how the process initiated by UV radiation is accelerated and reinforced by heat.…”

Section: Excimer Laser Coloration Vs Turin Shroud Colorationmentioning

confidence: 99%

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Shroud like coloration of linen, conservation measures and perception of patterns onto the Shroud of Turin

Lazzaro

Murra

2015

SHS Web of Conferences

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Abstract. We present new experimental results on ultraviolet laser processing of linen fabrics that complete and update the previous studies at the ENEA Research Centre of Frascati seeking a coloration mechanism able to reproduce the microscopic complexity of the body images embedded onto the Shroud of Turin. The achievement of a Shroud-like coloration of linens by using vacuum ultraviolet light pulses allowed to recognize the main photochemical reactions possibly involved in the coloration process. The identification of these reactions offered hints for long-term conservation measures of the body images on the Shroud of Turin. Finally, we discuss how image processing of photographs of the Shroud may cause misleading effects, which led some researchers to perceive, e.g., inscriptions and a second face on the backside of the cloth, which are unlikely to be on the Shroud, confirming that there is a narrow boundary between image enhancement and manipulation.

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“…The partial inhibition of fluorescence induced by both UV and VUV laser radiation shown in [8,10,11] is an additional feature of our coloration similar to the TS image.…”

Section: Excimer Laser Coloration Vs Turin Shroud Colorationmentioning

confidence: 55%

Section: Arf Excimer Lasers Irradiationsmentioning

confidence: 62%

Section: Shs Web Of Conferencesmentioning

confidence: 94%

Section: Excimer Laser Coloration Vs Turin Shroud Colorationmentioning

confidence: 99%

Section: Excimer Laser Coloration Vs Turin Shroud Colorationmentioning

confidence: 99%

See 3 more Smart Citations

Shroud like coloration of linen, conservation measures and perception of patterns onto the Shroud of Turin

Lazzaro

Murra

2015

SHS Web of Conferences

Self Cite

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Raman spectral mapping reveal molecular changes in cellulose aging induced by ultraviolet and extreme ultraviolet radiation

Botti,

Di Lazzaro,

Flora

et al. 2023

Cellulose

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Blood stains of the Turin Shroud 2015: beyond personal hopes and limitations of techniques

et al. 2016

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In the early '80s, evidence was provided that, rather than a dye (red okra), hemoglobin was indeed responsible for the alleged blood stains of the Turin Shroud. Such stains were shown to belong to an MNS positive individual of the AB group, and the halos surrounding the blood stains were compatible with serum containing trace amounts of bilirubin, albumin and immunoglobulins. However, being only based on indirect and circumstantial evidence, most of these data were challenged. In the late '90s, together with the evidence of the gene coding β-globin, contamination between male and female DNA was documented on the Turin Shroud. Although the presence of male was more noticeable than female DNA, these data were considered null and void. These days, to establish that blood indisputably belongs to an MNS positive individual of the AB group, and to exclude DNA contamination, high-specificity techniques with monoclonal antibodies and molecular studies on nuclear and mitochondrial DNA are needed. Indeed, consistent with DNA contamination on the Turin Shroud, sequences from multiple subjects of different ethnic origins have been recently detected on the human mitochondrial genome extracted from dust particles of the linen. Innovative concepts are likely to come up using modern research approaches to evaluate the issue of blood stains of the Turin Shroud. Nor can we rule out the possibility that religious implications of the new findings on the Turin Shroud might be envisaged. Conceivably enough, the ongoing debate will be fierce and passionate, especially in the media.

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Superficial and Shroud-like coloration of linen by short laser pulses in the vacuum ultraviolet

Cited by 16 publications

References 24 publications

Shroud like coloration of linen, conservation measures and perception of patterns onto the Shroud of Turin

Shroud like coloration of linen, conservation measures and perception of patterns onto the Shroud of Turin

Raman spectral mapping reveal molecular changes in cellulose aging induced by ultraviolet and extreme ultraviolet radiation

Blood stains of the Turin Shroud 2015: beyond personal hopes and limitations of techniques

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