In the United States, milk is commonly packaged in
waxed paperboard, high-density polyethylene (HDPE)
or polyethylene terephthalate (PETE). The HDPE
transmits 57 to 60% of light wavelengths between 300
and 700 nm (van Aardt et al., 2001; Duncan and Hannah,
2012). The packaging material frequently used for
single-serve milk products, PETE, transmits up to 75
to 85% of visible light. Packaging material can have a
protective effect on milk quality through blocking or
reducing the transmission of certain light wavelengths
(Webster et al., 2009). It is important, then, to develop
packaging materials that are consumer friendly yet
block the most damaging wavelengths to milk quality.