Ngwaahịa a bụ ihe mkpuchi okpomọkụ nke ọkwa ihe nkiri na ihe mgbochi infrared masterbatch, nke kwesịrị ekwesị maka ịmepụta ọkụ ọkụ ọkụ (VLT) mkpuchi ọkụ na ihe nkiri ma ọ bụ mpempe akwụkwọ na-azọpụta ike.