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Old 26th July 2013, 03:10 AM   #8803
hugh farey
Join Date: Apr 2013
Posts: 506
Let's look at another anomaly, shall we? I only ask because some of you may be more familiar with reflectance spectra than I, and this anomaly concerns them.
Four spectra:
1) Reflectance spectrum of 63-day old blood, from "Age estimation of blood stains by hemoglobin derivative determination using reflectance spectroscopy," Forensic Science International, Volume 206, Issues 1–3, 20 March 2011, Pages 166–171, by Bremmer et al. The important diagram is at: (Figure D) or can be found just by Googling it.
2) Reflectance spectrum of red ochre from Roussillon (Southern France), from "Relationship between the colour of ochre from Roussillon and the content of iron-bearing minerals," Applied Clay Science, 01/2011; 51:54-60. This is at:, Figure 9.
3) Reflectance spectrum of vermilion, from "Art and Science: Renaissance Illuminations," National Gallery of Art, Washington, at
4) Reflectance spectrum of shroud blood. From "Ultraviolet-visible reflectance and fluorescence spectra of the Shroud of Turin," Applied Optics, 1980 Jun 15;19(12):1930-6, by Gilbert and Gilbert. The important diagram is reprinted at

As you will see, there is a pronounced bump-and-dip in the shroud spectrum at about 620nm, which is not present in either of the other two. In fact, the diagram shown is an average of the spectra from four bloodstains (not on the internet unfortunately) all of which show the same distinct bump-and-dip. Neither the old blood spectrum, nor the ochre spectrum, nor the vermilion one, matches this pattern. The nearest I can get to it is a methemoglobin spectrum at (Figure 4 - an absorption spectrum, and Figure 5 - a reflectance spectrum), but it is not very clear. Can anyone find a better match for the shroud?
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