Mr. Graves said that in areas with air problems, the public would probably vote in favor of reformulated paints and varnishes even if the new products were inferior in qualities like ease of application, color fastness, wear resistance and stain resistance.

Vitreous enamel has many excellent properties: it is smooth, hard, chemically resistant, durable, scratch resistant (5-6 on the Mohs scale), long-lasting color fastness, easy-to-clean, and cannot burn.

The vat dyes have high color fastness, which is uncommon in other dye classes.

Not to mention the fact that manufacturers of Aztec merchandise in that era refused to guarantee the color fastness of San Diego State's purple hues.

The dyes used to create colored Type 2 plates can vary significantly in their heat and color fastness, so are often limited to indoor or short-term outdoor usage.

Mordants were often required to alter the hue and intensity of natural dyes and improve color fastness.

For example, the γ crystal modification of unsubstituted quinacridone provides a strong red shade that has excellent color fastness and resistance to solvation.

Artificial sunlight (solar simulators) are also used for sun light exposure testing and of color fastness and material stability for textile, plastics and paints.

Dampen a white handkerchief and rub it over the pile to check for color fastness.