5. a. Beginning two years after the effective date of this act, all glass containers sold or offered for sale in the State by a manufacturer shall contain, on average, at least 35 percent postconsumer recycled content; except that, if a manufacturer certifies to the department that its use of postconsumer recycled content is made up of at least 50 percent mixed-color cullet, then the glass containers shall only be required to contain, on average, at least 25 percent postconsumer recycled content.
b. As used in this section, "mixed-color cullet" means cullet that does not meet the American Society for Testing and Materials (ASTM) standard specifications for the color mix of color-sorted, post-filled glass as a raw material for the manufacture of glass containers.