This is a guide for rotational molders to select and use colorants properly. It may help colorant suppliers understand how to better develop colorants for rotational molders. The intent of this book is to provide basic information on how to select and use colorants for the rotomolding process. Since colorants affect molding cycles, part cost and physical properties of the finished parts it is important to understand the basic fundamentals of colorants designed for rotational molding polyethylene. Different methods of coloring will be discussed and a basic trouble shooting guide and a glossary of terms are included.