Rit Dyemore Synthetic Dye
"A dye made specifically for synthetic fabrics, which includes anything with 35% or more polyester, acrylic or acetate. Each little bottle packs a colorful punch and is ready to deliver a custom touch to garments new and old, household items, and more. It even works on 3D printed items, lacrosse sticks, wigs and most plastics. Plus, just like our original formula, Rit DyeMore is non-toxic and safe for sewer and septic systems."
Rit Dye Website