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26 Cards in this Set
- Front
- Back
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Spectrum? |
White natural sunlight is made up of 7 colors. Can be seen by a prism. Called spectrum. |
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Retina cells that distinguish values and brightness |
Rod cells |
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Retina cells that distinguish hue, chroma |
Cone cells |
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What is hue? |
Hue is the name of the color. |
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Acronym for hue |
Roy G biv Red orange yellow green blue indigo violet |
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Universal color coding system invented by |
Albert Henry Munsell |
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Munsell divided color into? |
Hue, chroma, value |
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Chroma? |
Saturation or intensity of hue |
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Primary hues |
Red blue yellow |
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Secondary hues |
By mixing 2 primary hues |
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Violet |
Mixing red and blue |
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Green |
By mixing blue and yellow |
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Orange |
By mixing red and yellow |
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3 characteristics of the color wheel |
Alternate primary and secondary hue.
Opposite hues are always primary to secondary
Opposite hues cancel out and form grey color |
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How does aging change hue? |
In young, hue is uniform. Older people will have variations of hue due to extrinsic and intrinsic staining. |
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How does aging affect chroma? |
Chroma increases with age. Bleaching can reduce chroma. |
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What is value? |
It is the relative lightness or darkness of a colour. A light tooth will have a higher value while a dark tooth will have a lower value. |
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What is the most important property of a colour in shade matching ? |
Value. Slight variations in hue or chroma won’t be noticeable if value matches |
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What are complimentary hues? |
Colours opposite to one another in the colour wheel are known as complimentary hues. |
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What is intensification? |
When complimentary hues are placed next to each other they intensify their chroma. |
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What is Hue sensitivity? |
While shade matching if you look at a hue for more than five seconds the eye becomes biased towards that shade. |
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How can we avoid hue sensitivity? |
Look away at a blue colour so that the eyes become more sensitive to the orange yellow spectrum which is more important for shade matching |
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What is metamerism ? |
The phenomenon of seeing two different colour samples as one hue under one light source while seeing them as two hues in a different light source |
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Example of metamerism |
A pure green color will be seen as pure green in any light source . But a green made up of blue and yellow mixture will show up in a different hue if the light source is lacking one of the blue or yellow light spectra. |
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Example of metamerism |
A pure green color will be seen as pure green in any light source . But a green made up of blue and yellow mixture will show up in a different hue if the light source is lacking one of the blue or yellow light spectra. |
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Relevance of metamerism in cosmetic dentistry |
A shade button may match in the incandescent light of the operator lamp but may not match in the fluorescent lighting of the patients workplace |
