Proceedings e report - Firenze University Press
Proceedings e report - Firenze University Press
Proceedings e report - Firenze University Press
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ultramarine<br />
[bad]<br />
titanium white<br />
[medium]<br />
napples yellow<br />
[medium]<br />
cadmium<br />
yellow (citron)<br />
WOOD SCIENCE FOR CONSERVATION OF CULTURAL HERITAGE<br />
HL 0.90<br />
(0.79)<br />
CM 0.39<br />
(0.29)<br />
HL -1.60<br />
(0.62)<br />
CM -1.31<br />
(0.46)<br />
HL 0.82<br />
(0.33)<br />
CM -0.66<br />
(0.08)<br />
HL -1.39<br />
(0.25)<br />
[bad] CM -0.20<br />
(0.18)<br />
cadmium<br />
yellow<br />
HL 0.54<br />
(0.59)<br />
[bad] CM 2.01<br />
(0.48)<br />
ochre yellow<br />
[bad]<br />
HL 4.29<br />
(0.75)<br />
CM 3.71<br />
(0.65)<br />
ochre yellow<br />
Cd yellow<br />
Cd yellow (citron)<br />
ultramarine<br />
cobalt blue<br />
Solferino lake<br />
cadmium red<br />
napples yellow<br />
titanium white<br />
Brunswick blue<br />
Prussian blue<br />
silver white<br />
ivory black<br />
raw umber<br />
poppy seed oil<br />
linseed oil<br />
rabbit-skin glue<br />
2.00<br />
(0.94)<br />
5.45<br />
(0.41)<br />
0.26<br />
(0.07)<br />
-0.12<br />
(0.02)<br />
-0.18<br />
(0.06)<br />
-0.51<br />
(0.06)<br />
1.03<br />
(0.15)<br />
0.23<br />
(0.17)<br />
0.31<br />
(0.37)<br />
0.75<br />
(0.45)<br />
-0.86<br />
(0.33)<br />
0.50<br />
(0.21)<br />
233<br />
-3.00<br />
(1.17)<br />
-6.05<br />
(0.35)<br />
0.76<br />
(0.20)<br />
1.45<br />
(0.10)<br />
-1.57<br />
(0.55)<br />
-3.70<br />
(0.53)<br />
-1.92<br />
(0.47)<br />
-0.20<br />
(0.30)<br />
2.85<br />
(1.29)<br />
5.09<br />
(1.69)<br />
4.30<br />
(0.66)<br />
5.34<br />
(0.38)<br />
3.32<br />
(1.32)<br />
7.05<br />
(0.43)<br />
0.76<br />
(0.21)<br />
1.45<br />
(0.10)<br />
-1.58<br />
(0.55)<br />
-3.72<br />
(0.53)<br />
-1.96<br />
(0.47)<br />
-0.21<br />
(0.30)<br />
2.70<br />
(1.30)<br />
4.91<br />
(1.70)<br />
3.55<br />
(0.66)<br />
5.06<br />
(0.28)<br />
1.37<br />
(0.72)<br />
3.83<br />
(0.28)<br />
-2.26<br />
(0.55)<br />
0.77<br />
(0.43)<br />
0.18<br />
(0.08)<br />
0.59<br />
(0.08)<br />
-0.61<br />
(0.10)<br />
-0.14<br />
(0.11)<br />
0.67<br />
(0.24)<br />
1.05<br />
(0.28)<br />
2.61<br />
(0.33)<br />
1.81<br />
(0.34)<br />
CM<br />
HL<br />
0 2 4 6 8 10<br />
dE* [CIELAB units]<br />
3.72<br />
(1.09)<br />
8.15<br />
(0.36)<br />
1.80<br />
(0.56)<br />
1.96<br />
(0.17)<br />
1.79<br />
(0.51)<br />
3.79<br />
(0.34)<br />
2.58<br />
(0.38)<br />
0.36<br />
(0.29)<br />
2.92<br />
(1.27)<br />
5.52<br />
(1.53)<br />
6.14<br />
(0.70)<br />
6.52<br />
(0.51)<br />
Fig. 1. Total colour differences between unirradiated and irradiated samples (A)<br />
For samples prepared with binders (rabbit skin glue, linseed oil and poppy seed oil), without pigments,<br />
the agreement was good. In this paper are presented only the samples with 12 layers of binders; for<br />
samples with a lower number of layers the agreement is much better. The highest disagreement, only<br />
quantitative, is for lightness (L*): CM indicates a higher difference in L*.<br />
Regarding the effect of gamma irradiation, there are small colour differences; even in the case of<br />
rabbit skin glue, the main component of colour difference is from chroma- considering 12 layers of<br />
binder and 200 kGy, this difference is still acceptable, although this dose is 20 times the reference<br />
dose for disinfections.<br />
In the case of samples prepared with different pigments in mixture with poppy seed oil, the agreement<br />
between the two spectrophotometers is depending on the uniformity of the sample. One can observe<br />
1.60<br />
3.69<br />
1.00<br />
1.51<br />
0.82<br />
1.79<br />
0.91<br />
0.15<br />
1.14<br />
2.10<br />
3.19<br />
2.91
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