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# Elaich module 5 solution exercise 5b

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ELAICH - Educational Linkage Approach in Cultural Heritage....

ELAICH - Educational Linkage Approach in Cultural Heritage.

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• 1. Educational Linkage Approach In Cultural HeritageE x e r c i s e 5.BAdvanced CourseModule 5 Monitoring & MaintenanceTopic 5.1 To Monitor or not to Monitor, that is the question! Solution of Exercise 5.B Hands on materials: how can we measure the colours? Authors: Prof. Guido Biscontin, Dr. Francesca Caterina Izzo, Prof. Elisabetta Zendri, Ms. Laura Falchi- Ca’ Foscari University of Venice Exercise 5.B part 1 Question: Consider the following colorimetric data measured on different samples (A, B and C). Sign the correct position of the point in the CIE L*a*b* space. Answer: A= yellow B= medium grey A A B B C C= dark red C 1
• 2. Educational Linkage Approach In Cultural HeritageE x e r c i s e 5.B Exercise 5.B part 2 Calculate ∆E from the data reported in the following table. samples ∆L ∆a* ∆b* ∆E A 41 40 12 59 B 18 20 4 27 C -26 30 86 95 Exercise 5.B part 3 Consider the following colorimetric data measured after a conservation treatment expressed as difference between the same sample before (not reported in the table) and after the treatment(samples A, B, C, D) samples ∆E ∆L ∆a* ∆b* A 2.7 -2.63 0.25 0.56 B 1.72 -1.68 0.16 0.33 C 1.77 -1.77 0.03 -0.11 D 14.02 3.50 -1.23 -0.51 Questions: 1) Is sample B more reddish than sample C? 2) Is sample A more yellowish than the others? 3) Is sample A more yellowish than D? 4) Do you think a protective treatment can change the colour of a surface, why? 5) Do you think the colorimetric data reported differ too much from the original sample (look at the ∆E values)? Are these changes acceptable? Answers: 1) Yes, it is. 2) Yes, it is, because it has the highest value of ∆a*. 3) Yes, it is. 4) Yes, because the application of the products can increase the brightness of the surface; sometimes the products can become more yellow over the time and change the surface appearance. 5) The changes are all acceptable, with the exception of treatment D that has a ∆E value bigger than 5. 2