https://www.avient.com/news/new-colormatrix-optica-toners-avient-correct-color-enhance-performance-rpet
To help combat these issues, Avient today announced the launch of ColorMatrix™ Optica™ PET blue toners and colorants, which enable enhanced recyclability of PET packaging.
Formulated for addition to virgin PET and recycled PET (rPET), heat-stable ColorMatrix Optica blue toners work to correct and reduce the yellowing or color variation that typically occurs during the recycling process.
ColorMatrix Optica blue toners are formulated for injection molding and extrusion processes, and are commercially available in major global markets.