Lines are not plotting dark enough

I have certain objects in my drawing that are plotting lighter and thinner than the other objects in the drawing with the same properties. The same properties are: Layer, Linetype, Color, Thickness. These are the ones I can think of. They appear perfect on screen but then they plot different. The Plot Style (Pen Assignments) I am using is "None"

Also, these are not blocks. My huntch is that they came from another source and even though they have the properties I assinged to them, they have other attributes that override these property assingments. Can I be right?

Try setting the pen assignments to monochrome and see what happens.

I need to show my polylines that define the workspaces in blue and the gross line in red. Monochrome will not work. I am going to try and create a plot style and see.

It would if you used TrueColor for the two lines that you want in blue and red.

Why not just use the default plotstyle, Acad.ctb or stb. It usually plots weights and colors exactly as specified. None for a plot style implies just that, None.