Technical photography for cultural heritage Francesca Piqué Conservation Process CONSERVATION

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1 Technical photography for cultural heritage Germolles, 6 April 2016 Francesca Piqué Conservation Process Information gathering Monitoring & Maintenance CONSERVATION Assessments Intervention Planning 1

2 Impossibile visualizzare l'immagine. Technical Photography 5 types of recording : 1. Visible reflected light (vis) 2. Visible raking light (rad) 3. Infrared reflected radiation (IRr) 4. Ultraviolet reflected radiation (UVr) 5. Ultraviolet induced visible luminescence (Fluorescence) (UVf) Post-production & creation of false color images 6. Infrared reflected radiation false color (IRfc) 7. Ultraviolet reflected radiation false color (UVfc) Provides Information on an area = it is a mapping technique Different optical behavior related to presence of different materials present on the surface. It is practically IMPOSSIBLE to obtain material identification, but important indications suggesting location for point analysis and for sampling. NON Invasive investigations _ Definition Investigations that provide information without removal of material (i.e NO SAMPLING) 2

3 Impossibile visualizzare l'immagine. INVESTIGATIONS Non-invasive Invasive Mapping Point analysis Non-destructive Destructive Technical photography Technical photography SIMPLE TECHNIQUE camera Illuminators filters 3

4 Impossibile visualizzare l'immagine. Instrumentation Camera: CANON EOS 5D Mark II, standard CANON IR blocker removed and replaced with IDAS/AR clear filter (focusing) Illuminators: VIS & IR: Tungsten Lowel V (500W) lights UV: mercury vapour lamps with DUG11 filters (to block visible light) UV handheld with high intensity UV (250 GS H1/BLwith no filters Filters: IDAS (IR and UV blocking) for Vis RG830 (block IR <830nm) for IRr KV418 (block UV radiation) and Idas for Uvf DUG 11 (block visible light) for URr 7 Night vision camera _ Sony Cyber-shot 4

5 Impossibile visualizzare l'immagine. Illuminator for VIS e IR Tungsten Lowel V (500 W)1-10CE (230V) Tungstane lamp emission spectrum with low UV and high IR radiation. Illumination for UV Emission spectrum of a High-pressure Hg vapor lamps (Wood lamp) with max emission at 365nm and secondary emissions at 334nm e 313nm. There some emission also in the visible (violet and blue). edscient/reflectultraviol/sources/sources.htm 5

6 Impossibile visualizzare l'immagine. Technical photography Reflected Vis (Vis) UV-induced Vis fluorescence (UVf) Vis + UV + IR source UV, IR block filter Reflected IR (IRr) FC UV Reflected UV (UVr) FC Examples: Technical photography 6

7 15 th C wall paintings in Santa Maria degli Angeli, Locarno VIS RAK Raking light enhances preparatory techniques: Plaster patches, incisions, use compass, deterioration 7

8 VIS IRfc Blue Different IR behavior VIS UVf Residues of fluorescent mordant UVf generally indicates presence of organic materials (binders - colorants) Some inorganic materials (ZnO, Calcite) also emit UVf. False NEGATIVE: No UVf does NOT mean no organic material 8

9 Impossibile visualizzare l'immagine. Varallo, Chapel 34 VIS Wall paintingy by Antonio d'enrico (Tanzio da Varallo) '( ). IRfc Smaltino Azzurrite 9

10 Impossibile visualizzare l'immagine. ZnO is fluorescent Limitations of UV_induced visible fluorescence Pictures of painting models (made with same materials) taken with a DIFFERENT digital camera and after DIFFERENT ageing conditions SUPSI MA Thesis by C. Kock Dandolo, 2011 Technical photography Application Measurement Excitation Contribute to Identification of area with different optical behavior Reflected VIS light Emitted Fluorescence Reflected IR radiation Reflected UV radiation Mapping pigments IR false color UV false color Direct Y Technological investigations Indirect N Technological investigations 10

11 Technical photography Germolles 14th C wall paintings, France Technical photography MACRO MACRO Impossibile visualizzare l'immagine. MICRO Dino-lite digital microscope pro AM4 FVW - VIS & UV: Leds and portable Camera: CANON EOS 5D Mark II, standard CANON IR blocker removed and replaced with IDAS/AR clear filter (focusing) Illuminators: VIS & IR: Lowel V (500W) lights UV: mercury vapour lamps with DUG11 filters (to block visible light) UV handheld with high intensity UV (250 GS H1/BLwith no filters 11

12 MACRO MACRO Impossibile visualizzare l'immagine. Sometime in the Mr. Jacques Desvignes (a local architect friend of Matthiew s grandparents) took on the task to remove the stucco plaster from the room and discovered the letters on the wall. 12

13 Visible reflected (VIS) Infrared reflected (IRr) Infrared false color (IRfc) Large areas Ger_bn_n_vis Ger_bn_n_rak Ger_bn_n_irr Ger_bn_n_uvr Ger_bn_n_uvf 13

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15 VIS RAK VIS UVF UV fluorescence: organic binders (original or added) 15

16 VIS IRR distinction of colours / coatings VIS UVR distinction of colours / coatings 16

17 VIS IRFC VIS UVFC 17

18 Technical photography MACRO MACRO Impossibile visualizzare l'immagine. MICRO Dino-lite digital microscope pro AM4 FVW - VIS & UV: Leds and portable Camera: CANON EOS 5D Mark II, standard CANON IR blocker removed and replaced with IDAS/AR clear filter (focusing) Illuminators: VIS & IR: Lowel V (500W) lights UV: mercury vapour lamps with DUG11 filters (to block visible light) UV handheld with high intensity UV (250 GS H1/BLwith no filters Micro technical photography Dressing room Countess of Never Doorway Images: Nutsa Papiashvili (SUPSI) 18

19 Thermography Process COST is supported by the EU RTD Framework Programme First Working Group Meeting of COSCH, Mainz, 27/03/2013 ESF provides the COST Office through an EC contract 19

20 COST is supported by the EU RTD Framework Programme First Working Group Meeting of COSCH, Mainz, 27/03/2013 ESF provides the COST Office through an EC contract COST is supported by the EU RTD Framework Programme First Working Group Meeting of COSCH, Mainz, 27/03/2013 ESF provides the COST Office through an EC contract 20

21 COST is supported by the EU RTD Framework Programme First Working Group Meeting of COSCH, Mainz, 27/03/2013 ESF provides the COST Office through an EC contract ca. 50 x Samples examination 1 mm ca. 200 x 0.2 mm Images: Nutsa Papiashvili (SUPSI) 21

22 Impossibile visualizzare l'immagine. Samples examination Cross section examination Images: Nutsa Papiashvili (SUPSI) Samples examination Images: Nutsa Papiashvili (SUPSI) 22

23 'Strategy for the assessment, conservation and maintenance of the 14 th century wall paintings at Germolles Student: Nutsa Papiashvili SUPSI, Master in Conservation and Restoration, MA 1 Module: MTH 1 Preparation dates: 1 19 June, 2015 CONCLUSIONS Technical photography contributes to: Technological studies (preliminary to other investigations) Diagnostic investigations Remedial treatment assessment Treatment evaluation over time ADVANTAGES: can be done on site by / with conservator-restorer data without taking samples Inform sampling strategy Affordable and relatively simple DISADVANTAGES: Limited specificity of information UVf requires darkness (new developments) 23

24 Impossibile visualizzare l'immagine. Flash Photography Giovanni Verri and David Saunders Xenon flash for reflectance and luminescence (multispectral) imaging in cultural heritage applications, British Museum, Technical Research Bulletin, Vol PLAN for TOMORROW: work in TEAMS INVESTIGATIONS in VISIBLE and INFRARED Macro: CANON and SONY (night vision) Micro: DinoLite with Vis, UV and IR in situ (FP) at microscopy station (downstairs) Software: Photoshop Dinolite 24

25 Thank you for your attention 25