In addition to scientific applications, rhodamines are often useful in ways that make them more familiar to a broader public. For example, some varieties of rhodamine are utilized in the textile industry and may be responsible for the pinkish hue of a silk shirt or the red coloring of a wool coat. Rhodamines are also often added to outdoor paints used for billboards and other forms of advertising. The strong fluorescing of the molecules in the dyes makes the signs easier to see, especially at night. Rhodamines do, however, exhibit a relatively poor stability in light, although the dyes are significantly more photostable than fluorescein dyes.