“…NFPC products are susceptible to sunlight [ 18 , 22 ]. Their exposure to UV light was discovered to contribute to a more significant decrease in the mechanical properties than exposure to microorganisms and high temperatures [ 23 , 24 , 25 , 26 , 27 , 28 ]. Tests on NFPC products’ resistance to sunlight are typically carried out with accelerated methods, using laboratory light sources [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ].…”