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Food Analysis > Color Analysis > Flashcards

Color Analysis Flashcards

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Gourmet Food flashcards
1
Q

Colorant

A

Any chemical that imparts color
Natural or synthetic

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2
Q

Pigment

A

Natural substance in plant or animal tissue that imparts color

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3
Q

Dyes

A

Any substances that lend color to material
Food grade water soluble colorant
Certified by FDA

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4
Q

Lakes

A

Oil dispersible colorants

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5
Q

Properties of materials

A

Gloss
Transparency
Haziness
Turbidity

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6
Q

Factors in color detection

A

Light source
Object
Observer or detector

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7
Q

Light may be

A

Reflected
Transmitted
Absorbed
Refracted

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8
Q

White color

A

All radiant NRG is reflected

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9
Q

Black color

A

Light is absorbed almost completely

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10
Q

Color

A

Sensation experienced when visible light falls upon retina

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11
Q

Cones

A

Responsible for daylight and color vision

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12
Q

Rods

A

Responsible for night vision
No color discrimination

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13
Q

Types of cones

A

Sensitive to red, green, blue
Short, medium, long wavelengths

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14
Q

Opponent color theory

A

Signals from receptors transformed to 1 brightness signal + 2 hue signals (red/green, yellow/blue)

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15
Q

Reflect

A

Light ray approaches a surface and bounces back

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16
Q

Transmit

A

Light ray hits and object and penetrates through the material

17
Q

Absorb

A

Material soaks up light and absorbs it as energy

18
Q

Refract

A

Light wave changes direction as it passes from one medium to another

19
Q

USDA color standards ex

A

Honey
French fries
Peanut butter
Orange juice

20
Q

Lovibond scale

A

Tintometer
Vegetable oils
Beer
Syrups

21
Q

Lab color space

A

L = lightness (0-100)
a = red (+) or green (-)
b = yellow (+) or blue (-)

22
Q

Colorimeter

A

Spectrophotometers that scans the visible spectrum

Evaluate how much of the wavelength was absorbed

23
Q

Total color difference

A

dE indicates the magnitude of difference

24
Q

Tolerance contours

A

Colors in ellipses are indistinguishable from the color at the center
Contour of the ellipse represents just noticeable differences

25
Q

Spectrophotometer

A

Measures transmittance
More sensitive
More versatile

26
Q

How colorimeters work

A

Light shines onto surface of sample
As light reflects back into device, it passes through 3 filters

Filters provide values that match how our eyes see color

Food Analysis (19 decks)

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