## International Gold Number Color System
The International Gold Number Color System is a standardized method for designating the color of gold. It is based on the measurement of the gold’s spectral reflectance. The system was developed by the International Organization for Standardization (ISO) and is published as ISO 9236.
The International Gold Number Color System uses a three-digit number to designate the color of gold. The first digit indicates the hue of the gold, the second digit indicates the saturation of the gold, and the third digit indicates the lightness of the gold.
The hue of gold is determined by the wavelength of light that is reflected by the gold. The shorter the wavelength of light, the more red the gold will appear. The longer the wavelength of light, the more yellow the gold will appear.
The saturation of gold is determined by the amount of light that is reflected by the gold. The more light that is reflected, the more saturated the gold will appear. The less light that is reflected, the less saturated the gold will appear.
The lightness of gold is determined by the amount of black that is mixed with the gold. The more black that is mixed with the gold, the darker the gold will appear. The less black that is mixed with the gold, the lighter the gold will appear.
The International Gold Number Color System is used by jewelers, goldsmiths, and other professionals who work with gold. It is also used by collectors and consumers who want to identify and compare the color of gold items.
### Color Range
The International Gold Number Color System can be used to designate a wide range of gold colors. The color range includes:
* Pink gold: This type of gold has a reddish hue. It is created by alloying gold with copper.
* Yellow gold: This type of gold has a yellow hue. It is created by alloying gold with silver.
* White gold: This type of gold has a white hue. It is created by alloying gold with palladium or nickel.
* Green gold: This type of gold has a greenish hue. It is created by alloying gold with silver and copper.
* Blue gold: This type of gold has a bluish hue. It is created by alloying gold with indium or gallium.
The International Gold Number Color System is a valuable tool for anyone who works with or collects gold. It provides a standardized method for designating the color of gold, which can help to ensure accurate communication and comparison.
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