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Easily available dye or pigment to show bronzing?
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Salmon Egg
Jul 24, 2012, 10:46:45 PM7/24/12
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I am interested in demonstrating that strong absorbers of a colored
light reflect a complementary color when observed using specular
reflection.
In the old days, when red and green inks were available for fountain
pens, it was relatively easy to demonstrate that a line on a piece of
glossy white paper specularly reflected a complementary color.
On ordinary viewing, green ink would absorb red light and transmit green
light. The green light would reflect diffusely off of the white paper,
pass through the green ink again, and appear green. If you carefully
held the paper so that light would reflect off of the green ink as if it
were a mirror, the reflected light would have a reddish tinge.
A similar process took place with red ink. The light scattered by the
white paper back through the ink was red. The specularly reflected light
was green.
Many of the inks used in slick publications behaved similarly. In the
printing trade, this was known as bronzing.
MY QUESTION: What is readily available these days that can be used to
demonstrate this effect?
--
Sam
Conservatives are against Darwinism but for natural selection.
Liberals are for Darwinism but totally against any selection.
light reflect a complementary color when observed using specular
reflection.
In the old days, when red and green inks were available for fountain
pens, it was relatively easy to demonstrate that a line on a piece of
glossy white paper specularly reflected a complementary color.
On ordinary viewing, green ink would absorb red light and transmit green
light. The green light would reflect diffusely off of the white paper,
pass through the green ink again, and appear green. If you carefully
held the paper so that light would reflect off of the green ink as if it
were a mirror, the reflected light would have a reddish tinge.
A similar process took place with red ink. The light scattered by the
white paper back through the ink was red. The specularly reflected light
was green.
Many of the inks used in slick publications behaved similarly. In the
printing trade, this was known as bronzing.
MY QUESTION: What is readily available these days that can be used to
demonstrate this effect?
--
Sam
Conservatives are against Darwinism but for natural selection.
Liberals are for Darwinism but totally against any selection.
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