Yes, radiation can cross from the body to the cloth. Outside of a physics laboratory, in your modern mortuary or even a 1st century AD rock tomb, it would be thermal radiation (infrared light) that would be emitted from the cadaver, and then absorbed partially by the linen, only to be re-emitted as infrared.
There would be no chemical change – because infrared rays/photons only have enough energy to make the chemical bonds in a molecule vibrate or oscillate etc. They do not have sufficient energy to break chemical bonds – and chemical reactions involve breaking of one or more existing bonds as an obligatory first step.
Those who want us to believe that an image was formed on the cloth via a chemical change have an obligation to say what kind of electromagnetic energy – more energetic than infrared – passed from body to cloth, and then say how that radiant energy was able to produce an image – as distinct from a diffuse patch of chemically-altered linen.
The first law of photochemistry, the Grotthuss-Draper law, states that light must be absorbed by a compound in order for a photochemical reaction to take place.
For those who like numbers, check out this link, with quote: Absorption of visible and/or ultraviolet light by a molecule introduces energy sufficient to break or reorganize most covalent bonds.
From the relationship E = hc / λ, we see that longer wavelength visible light (400 to 800 nm) is less energetic (70 to 40 kcal/mole) than light in the accessible shorter wavelength (200 to 400 nm) near ultraviolet region (150 to 70 kcal/mole).
Let’s work our way up the energy scale. Was it visible light? How is/was a body able to emit visible light? Please propose a mechanism. Even supposing it was a one-off event (a “miracle” in common parlance) then kindly specify which chemical constituent of linen was able to absorb enough of that light energy to initiate a chemical change. In other words, specify the chromophore (“light absorbing species”), and the photochemical change. Explain how a material like linen that looks reasonably white or nearly so can absorb specific wavelengths from visible light yet still reflect or scatter what our eyes perceive as the balanced mix of wavelengths we call visible white light.
Or was it ultraviolet light? Yes, we know that uv light has sufficient energy to break certain chemical bonds in certain molecules, including colourless ones.
We rely on the uv of sunshine to break a particular bond in 7-dehydrocholesterol in our exposed skin to produce a precursor of Vitamin D, without which we would all be rickety.
Are you suggesting something similar happens in your radiation model? If so, explain how a body, other than an incandescent one like a star or other heavenly body, can produce and emit ultraviolet light. Then state which component of linen is able to absorb enough uv light to produce a chemical change that produces a sepia-coloured (yellow-brown) end product, strongly resembling a heat scorch. Then explain why the image should be peculiarly superficial, located almost entirely on the “loop-over” crown threads despite the radiation having an unobstructed path to inferior threads in the weave.
Is there insufficient energy in ultraviolet light for your liking? Are you thinking in terms of ionizing X-rays, or still more ionizing gamma rays?
Or do you envisage alpha-rays, more correctly particles, i.e. a stream of helium nuclei (He++) which we know are highly ionizing, but formed only by fusion processes within the cores of stars, or as the product of alpha decay of uranium atoms etc? How were these generated? How could they produce an image of the body, including the hair (keratin protein) without singeing or burning off the hair in a puff of smoke?
Methinks that’s sufficient to be getting on with for now. But I shall be back later with some pithy words on the subject of the “burden of proof”. Those of us who reject any kind of radiation ARE able to explain how an image is formed in the above diagram of the underside of a chin and the neck – see my posting that immediately precedes this one – although it involves making some dramatic changes to that tunnel-vision ‘cloth- loosely-draped-over-a- human-cadaver model’, one that might be seen as “begging the question” in logical and scientific terms. In other words, as Joe Nickell once described it, “starting with the desired answer and working backwards to the evidence.” So it’s somewhat galling to see postings that attempt to shift the burden of proof onto those who propose non-radiation models, contact models especially. The latter can explain the imaging of a neck or underside of a neck. We are still waiting for the radiationists to explain how that could happen in the above graphic with the yellow arrows.
Takeaway message: for radiation – any kind of radiation – to produce a chemical change, whether by specific action on chemical bonds or secondary thermal events, there HAS TO BE absorption first.
It is therefore incumbent on anyone proposing a radiation model to state the source and wavelength of the electromagnetic energy AND the nature of the absorbing chromophore.
It matters not how many letters someone has after his or her name . If they will not, or cannot do that, explain their model precisely in terms of conventional physics and chemistry, then they have no right to regard or describe themselves as scientists. They are merely modern-day successors to what used to be described as SNAKE-OIL MERCHANTS.
Postscript added Tuesday 5th Feb
Dan Porter has put up an interesting one this morning with a faint hint of the obverse side of the frontal image plus handy bleed through bloodstains, the one revealed when the Holland cloth was removed (2002?). With Mario Latendresse’s name mentioned, and with the rarely-seen image looking remarkable the same in hue as one of Mario’s Shroud Scope pictures, I thought it would be interesting to compare them side by side in the same orientation (which meant flipping the new one horizontally).
Here’s the result (which can no doubt be tweaked a bit more to get a better size match and alignment):
First impressions: I had expected a stronger imprint from the bridge and tip of the nose, if as I maintain the Shroud image had been imprinted from a hot metal or ceramic template, that being my preferred model.(Late ed: but maybe it was a rather flat bas relief with the nose intentionally of low profile to avoid excessive imprinting of that feature to prevent it dominating).
But I take heart from the fact that what little of the hair is visible in the obverse image is reasonably well imprinted. I suggested just a few days ago that a separate template may have been used for “hair”. How on earth an obverse-side image of hair could be obtained by radiation received on the frontal side is anyone’s guess – but some might think that the “radiationists” – or should that be ‘radiationista‘ – have enough problems as it is, accounting for the main side image, without worrying as to the mechanism of image migration to the opposite side of the fabric.
I need hardly add that thermal imprinting from a hot template always produces an obverse side image, as Paolo Di Lazzaro pointed out in his coin experiment – but only if the coin is overheated and/or held long enough against the cloth to get the desired result for posting to The Other Site, announced under the sotto voce headline: Colin Berry’s idea is untenable, and heat cannot produce a superficial coloration, together with the obligatory image of Don Quixote tilting at the windmill. 😉
Today’s visitors so far (see comments)
With this posting, I have now come full circle. Why? Because this image from my very first posting on the Shroud (Dec 30 2011) showed how one could produce a scorch image on cloth using radiant energy – a mixture of visible and infrared light from an ordinary ceiling spot lamp.
How? By drawing or painting the desired image onto cloth with charcoal, irradiating, then washing out the charcoal. Importantly, the areas without charcoal remained totally unscorched, because they reflected/scattered all but a small proportion of the incident radiation. Charcoal acted as an opaque absorbing thermosensitizer.
The radiationists have failed to specify what acts as efficient radiation-absorbing chromophores or pigments in their systems. (I do not regard the ENSA studies with uv excimer laser radiation as efficient: all that energy for just a small discoloration?) Repeat: no absorption means no thermal or chemical action on linen constituents.