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/search?l=silver-list@eskimo.com&q=subject:%22Re%3A+CS%26gt%3BUh+Oh...Blue+Fingernails%22>
Marshall Dudley
<http://www.mail-archive.com/search?l=silver-list@eskimo.com&q=from:%22Marshall+Dudley%22>
Mon, 4 Nov 2002 07:17:45 -0800
<http://www.mail-archive.com/search?l=silver-list@eskimo.com&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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