a system for recycling post - industrial - use plastic waste based on coloring an object , which will become post - industrial - use plastic waste , a user - specified color , said color correlated with a system for identifying plastic based on the resin content of the object . said object , in the user - specified color , provided to the end user to protect a part shipped by a parts manufacturer , with sorting of the objects into homogenous resin groups being done by the end user based on color .