Please find below a formal notice from Avery Dennison outlining the reason for the colour shift in selected matte materials: 


"For reasons beyond our control, a raw material component change was required on Avery Dennison matte products.

Due to the component change, we have discovered a slight shift in color and finish in some SW900 Supreme Wrapping Film™, Digital Overlaminates (DOL), HP750 and SC900/950 products. This color shift will lead to an internal adjustment to our color baseline on the impacted products.

The component change is effective as of April 3, 2023."

Affected Products: The full list of affected products can be found here