What fabrics are hardest to dye?

Fabrics that are hardest to dye typically include those made from synthetic fibers such as polyester, nylon, and acrylic. These materials often require specialized dyes and high temperatures to achieve effective coloration due to their chemical structure, which resists absorption. Additionally, fabrics like silk and certain blends may also present challenges because of their unique properties and varying dye affinities. Natural fibers like cotton and wool are generally easier to dye compared to these synthetics.