Color fastness is a term used to describe the resistance of a material or textile to change in color when exposed to various external factors such as light, washing, rubbing, and perspiration. It is an important quality parameter for textiles and is often assessed using standardized testing methods.

The color fastness standard refers to the set of guidelines and criteria established by international organizations and regulatory bodies to evaluate and classify the color fastness properties of textiles. These standards provide a common framework for manufacturers, retailers, and consumers to assess and compare the color fastness of different materials.

One of the most widely recognized and used color fastness standards is the ISO (International Organization for Standardization) standard. ISO has developed a series of standards under the ISO 105 and ISO 105-B series, which cover various aspects of color fastness testing.

ISO 105-Part 1: This standard specifies the general principles for determining the color fastness of textiles to various factors such as light, washing, and rubbing. It provides guidelines for sample preparation, test conditions, and evaluation methods.

ISO 105-Part 2: This standard focuses on the color fastness to rubbing or abrasion. It provides methods for assessing the resistance of textiles to dry and wet rubbing.

ISO 105-Part 3: This standard deals with the color fastness to washing and specifies methods for evaluating the resistance of textiles to domestic and commercial laundering.

ISO 105-Part 4: This standard covers the color fastness to perspiration. It provides methods for assessing the resistance of textiles to acidic and alkaline perspiration.

ISO 105-Part 5: This standard addresses the color fastness to light. It specifies methods for determining the resistance of textiles to the fading effect of light exposure.

Apart from ISO standards, there are other color fastness standards developed by organizations such as AATCC (American Association of Textile Chemists and Colorists) and ASTM (American Society for Testing and Materials). These standards may have specific test methods and evaluation criteria tailored to different types of materials and end-use applications.

It is important for manufacturers and retailers to comply with these color fastness standards to ensure that their products meet the required quality and performance levels. Compliance with these standards also helps in providing accurate and reliable information to consumers regarding the color fastness properties of textiles.

In summary, the color fastness standard refers to the guidelines and criteria established by international organizations to evaluate and classify the color fastness properties of textiles. These standards provide a common framework for assessing and comparing the color fastness of different materials, ensuring product quality and consumer satisfaction.