Flexography is a printing process used for a large number of substrates and applications, as such the process colors can differ based on the pigments based on in their properties. Although there are color specifications, there is no general norm for density values leaving a number of open questions... What is the correct density for a printed job? Why do we find different values from company to company? Who is right? The reality is that in recent years a popular belief has emerged: the higher the density, the better the result. Ideally, an attainable, repeatable, and consistent standard should be established maintaining a correlation closest to the color proof. Image 1. Density values for different levels of reflectance.  Source: A Guide to Understanding Graphic  Arts Densitometry by X Right To optimize solids we must first review the basics...what is density, or to be more accurate, reflection density?  According to the Flexographic Image Reproduction Standards & Tolerance