The absorption of the light depends on the particle size. But we are
actually talking about the particle size of the silver oxide, citrate,
ascorbate or whatever, not the colloidal part. When in liquid and not
saturated (approximately 13 ppm of silver oxide), this falls into the uv
range. Sunlight, and some fluorescents will give you that. If however
you apply to skin, as the water evaporates the silver compound will
start to form crystals. The absorption band will increase in wavelength
as the crystal size grows, ultimately covering the entire visible
spectrum. Also there is a physical process where the silver colloidal
can also absorb light, once again the wavelength depending on size, then
once excited, pass the excite electron on to the silver compound,
causing it to reduce as well.
So, I guess what I am saying is that it is not easy to determine if you
might have a problem or not. But the longer the wavelength, I would
expect the less likely there would be any problem.
Marshall
On 11/3/2013 12:28 PM, sol wrote:
sol wrote:
Basic question re silver in the skin "photo-developing" in light is
which light wavelength causes the "developing".
Will the wavelengths 590, 660, 880 cause silver on or in the skin to
"develop"?
thanks,
sol
Looking through the archives I found this post from Marshall Dudley:
Unless I misunderstand and unless skin has "other substances in the
emulsion
which absorb the light, then pass the energy on to the silver to
expose it." I should be ok using LEDs of 590 to 880.
I guess I can only try and watch for any worsening of the greyed skin.
sol
Re: CS>Uh Oh...Blue Fingernails
<http://www.mail-archive.com/[email protected]&q=subject:%22Re%3A+CS%26gt%3BUh+Oh...Blue+Fingernails%22>
Marshall Dudley
<http://www.mail-archive.com/[email protected]&q=from:%22Marshall+Dudley%22>
Mon, 4 Nov 2002 07:17:45 -0800
<http://www.mail-archive.com/[email protected]&q=date:20021104>
For a photon of light to cause any action, it must be absorbed.
Clear CS does
not absorb any light in the visible spectrum at all, so if any change
were to be
expected it would HAVE to come from interaction with ultraviolet.
Now if you
have yellow colored CS then the light absorbed is in the violet and
ultraviolet
spectrum, so the longest wavelength that could affect it wold be violet.
It is very well known how silver compounds at least react with
light. This is
the basis of almost all photography. The longer the wavelength of
the light, the
larger the particle has to be normally. Thus film use to not be
sensitive to red
or infrared light at all. However more modern films have other
substances in the
emulsion which absorb the light, then pass the energy on to the
silver to expose
it. This allows modern fine grained films to be sensitive to all
colors, and
even infrared.
Thus it is apparent that for silver activation a resonance is not
required, only
a minimum quanta of energy.
Marshall
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