Color

PIRA classification 6F

Grayed Demos are either not available or haven't been built yet.

6F10. Synthesis and Analysis of Color

PIRA #

Demonstration Name

Abstract

6F10.10

color box

A commercial Singerman box projects blue, red, and green light onto a screen with individually variable intensity.

6F10.10

color box

Overlap red, green, and blue light of adjustable intensity on a translucent screen.

6F10.10

color box

The Welch color box shows the addition of the primary colors.

6F10.10

additive color mixing

Mix red, green, and blue in a color box.

6F10.11

color addition

Red, green, and blue lamps shine from the corners of a white triangle. A rod or rods are placed on the screen to show the colors of shadows.

6F10.12

cenco color apparatus

The primary colors can be projected onto a screen.

6F10.13

color synthesizer

A color synthesizer allows demonstration of the significance of dominate wavelength, purity, luminosity, etc.

6F10.15

color addition

Wratten filters Nos. 19, 47, and 61 are used to make a slide with 1/3 of a circle of each color. A projection arrangement shows the combination of colors and division of light between the separate colors.

6F10.16

color projector

Adapting a lantern slide projector for mixing primary colors.

6F10.17

projecting colors

Many color demonstrations are performed with a slide projector and slides reflected off swivel mirrors.

6F10.18

lantern slide colors

A diffraction grating is held in front of a lantern projector with seven slits, one side with primary additive colors, the other with subtractive, and the center white.

6F10.20

color filters

Cyan, magenta, and yellow filters are available as loose squares or fixed in a plexiglass holder for use on the overhead projector.

6F10.22

dichromatic primary pairs

Discussion of the standard light addition, subtraction, as they relate to two color mixing.

6F10.23

artist's colors

On why artists use red, yellow, and blue instead of red, green, and blue.

6F10.23

artist's colors - letter

Hey guys, artists use pigments, not light, and anyway the subtractive primary colors are cyan, magenta, and yellow. Information of 4-color printing and real artist's pigments too.

6F10.25

synthesis of colors

A disc with colored sectors appears white when rotated.

6F10.25

spinning color discs

Disks with colored sectors are spun until the colors blend together.

6F10.25

Newton's color disc

A spinning disc of colored sectors appears white.

6F10.26

weird slit with Hg light

A slit and "inverted slit" used with Hg and a prism produce the normal line spectra and "inverted spectrum" of complementary colors.

6F10.30

recombining the spectrum

Recombine the spectrum after passing through a prism to get white light or remove a color and get the complement.

6F10.30

recombining colors

Recombining dispersed light after reflecting out various colors, etc.

6F10.30

recombining the spectrum

Obtain a spectrum with a prism, reflect out a color with a small thin mirror, and recombine the light with a lens.

6F10.33

purity of the spectrum

A second prism at right angles bends each color without dispersion.

6F10.35

splitting and recombining

A half spectrum filter splits out light from a beam which is then recombined at a spot.

6F10.36

dispersion and recombination

Several variations of recombining dispersed light from a prism.

6F10.45

red and green

6F10.45

complementary shadow

Shadows of red and white lights illuminating the same object from different angles appear to produce green light.

6F10.50

filtered spectrum

Part of a beam of white light is projected through a prism. When a filter is inserted in the beam, the spectrum and transmitted light are compared.

6F10.51

liquid cell absorption

An absorbing solution is placed in a liquid cell placed in a beam of light before dispersion.

6F10.52

plotting absorption

A motor drive is connected to a grating and the output of a lead sulfide detector is plotted on a strip chart recorder as the spectrum is scanned with various filters and intensities. Reference: AJP 35(6),542-3.

6F10.52

spectra and liquid absorption

Absorption cells filled with liquids are used with a 35 mm projector and the B & L spectra projection kit.

6F10.52

filtergraph

A slide with four filters and the corresponding spectrographic diagrams.

6F10.54

photocell measurement of absorption

Use suitable sources, cells, and filters to measure absorption of substances with a photocell.

6F10.55

band absorption spectrum

A flask of nitrous oxide is placed in the beam of white light before dispersion by a prism spectroscope. Didymium glass and dilute blood are also suggested.

6F10.56

absorption spectrum of chlorophyll

Show the absorption spectrum of chlorophyll obtained by macerating leaves in methyl alcohol. Red and Green transmit.

6F10.57

water absorption bands

A monochrometer (38-5.11) is used to demonstrate water absorption bands.

6F10.61

metal films and dyes

A thin film of gold transmits green but looks reddish-yellow by reflection. Dyes also transmit and reflect different colors.

6F10.65

dichromatism

Green cellophane transmits more red light than green. Stack lots of sheets and the color of transmitted light changes from green to red.

6F10.70

three conditions for color

The three conditions are: Color must be in the source, the object must reflect or transmit the color, the detector must be sensitive to the color. Shine different colored light at different colored objects.

6F10.71

color due to absorption

Light from a projection lantern reflected off red, green, and blue glass to the ceiling is the same but the transmitted light is colored by absorption.

6F10.75

colored yarn

Skeins of colored yarn are illuminated with different colored light.

6F10.75

colors in spectral light

A rose is viewed in white, red, green, and blue light.

6F10.80

complementary color transitions

Lecture room experiments are proposed which demonstrate complementary color transitions due to complementary boundary conditions at the aperture.

6F30. Dispersion

PIRA #

Demonstration Name

Abstract

6F30.10

dispersion curve of a prism

Light passes through a grating and then through a second slit at right angles and a prism generating a dispersion curve in color on the screen.

6F30.15

deviation with no dispersion

Light passed through oppositely pointed crown and flint glass prisms adjusted to give light deviated in two directions but with no dispersion.

6F30.20

dispersion with no deviation

Light passes through prisms of crown and flint glass adjusted to give two beams of the same dispersion but different deviation.

6F30.30

anomalous dispersion of fuchsin

Overcoming the difficulties of showing anomalous dispersion with fuchsin.

6F30.30

anomalous dispersion of sodium

An absorption cell for the anomalous dispersion of sodium is described. Diagrams, Construction details in appendix, p.1354.

6F30.31

bending dark absorption line of Na

When salt is heated on a flame in the path of a narrow beam of light before dispersion, the edges of the spectrum close to the dark band bend up or down.

6F30.50

optical ceramics: dispersion

A custom fabricated prism made from LaSFN-9 glass shows a cutoff between transmission and total internal reflection that can be tuned through the visible spectrum by turning the prism.

6F40. Scattering

PIRA #

Demonstration Name

Abstract

6F40.10

sunset

Pass abeam of white light through a tank of water with scattering centers from a solution of oil in alcohol.

6F40.10

sunset

A beam of white light is passed through a tank of water and a solution of cedarwood oil in alcohol is poured in to create scattering centers.

6F40.10

artifical sunset

Pass a beam through a hypo solution and add acid.

6F40.11

sunset

Light scattering with a hypo solution.

6F40.11

sunset

HCl into hypo solution scatters blue light.

6F40.11

sunset

A beam of light is scattered when passed through water containing hypo and HCl.

6F40.12

various scattering centers, Mei

Alternatives to hypo for the sunset demo including latex spheres that demonstrate Mie scattering.

6F40.15

red and blue beam

A red beam is passed through a solution of gum mastic but a blue beam is not. Diagram.

6F40.20

optical ceramics scattering

6F40.20

optical ceramics: Rayleigh scatterin

Type 7070 glass is treated to induce glass-in-glass phase separation used to show Rayleigh scattering.

6F40.30

color of smoke

Cigarette smoke is blue, but after exhaling is white.

6F40.50

microwave scattering

Show scattering of microwaves with a dielectric dipole inserted in the beam. Picture.

6F40.60

multiple scattering

Examples of common observations inexplicable by single scattering, e.g., darkening of wet sand, whiteness of milk, etc., are discussed without invoking the complete incoherent scattering theory.

6F40.80

halos

Look at a point source lamp through a fogged microscope slide.

6F40.80

dust halos

A glass plate covered with dust is held in a beam that converges into a hole in a screen. Circular halos appear on the screen around the hole.

6F40.82

lunar halo picture

Picture and analysis of an unusual lunar halo.

Demonstrations

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