Solid hatch pales - how??

Hi everybody

I received a drawing, printed, and in dwg format. In couple of places
there is a solid hatch, but on paper those hatches gradually pale.
Example:
rectangle filled with solid red hatch, printed, bottom of rectangle is
solid red and as it gets to the top it is almost white. Blue rectangle
right next to red one is blue all the way.

How is this done, from ACAD, or some printer setting?

Thanks in advance!

 

Is the plot of a 'rendered' model?

 

I saw in a manual once that There's a command called PSFILL. It seems to
offer a way of filling objects in thew ay you describe as it showed
diagrams... but I could never get it to work.

 

Plain old solid hatch. On screen - filled, on paper - fades.
How did they print that?? Unfortunately i have no way of contacting
them (him, her... the "others" ).

 

No, plain 2d drawing.

 

Ooooooh. It fades on *paper*.

Could it be just a printer(head) problem?

 

That is the most likely possibility

 

Sounds like M-color add-on, something I'm trying to understand how to use,
its basically a printer configuration program.

 

No, it's probably some add on like Ron suggested, or exported and
printed from some other program.
It is done on facade of a building and looks absolutely great.

 

If there wasn't copyright stuff i would send it to you, but i'm not
comfortable with distributing other peoples work over the net, sorry.
Besides, there's really nothing to it, plain 2d drawing, at least it
behaves like that in acad, nothing special to see on screen.