Re: Pigment particals
SCHRAMMR@WLSVAX.WVNET.EDU
Mon, 05 Aug 1996 22:23:52 -0400 (EDT)
Let me put my physicists
hat on for a moment. Yes is a red pigment particle were small enough
it would appear blue. The sky appears blue, for example, because particles
suspended in the atmosphere are so small the can only reflect short
wavelength light waves from the blue end of the visable spectrum. If
you increase the size of the particle, it can reflect all wavelegths.
However, another phenomina is taking place with pigment. A red pigment
particle of sufficient size looks red because it is the nature of the
pigment to absorb all the wavelengths of light falling on it except
those we associate with red light.
I think the silver, or platinium particles that make up the image in a
silver print or platinium print are much smaller than the pigment
particles that make up the image in a gum print.
One way to measure the size of particles is to use a measuring microscope
(expensive).
Bob Schramm