Wool fibers are naturally water repellent and have colorfast properties.
The main disadvantage of a wool rug is that some rugs are not treated with a colorfast dye, so the rug will fade if placed in direct sunlight.
With colorfast additives, wool fabrics can now be placed in direct sunlight without the former issues of color fading.
Soy protein isolates were used with printing ink and paper in the printing process to bind the inks and make them colorfast.
If they are decorative in the sense that they complement the colors or décor of you bath but you plan to use them everyday, then you'll for sure want to buy quality towels that are soft, fluffy and colorfast.