Are you inking manually and scanning your work in?
Are your blacks looking a little washed out?
Not the deep, rich, saturated blacks that you intended?
Does your lineart and resultant artwork fail to 'pop'?
Then I might have a solution or two...
You already know that scanners always have a problem creating deep rich blacks. But not how to fix it.
Why? It's b/c the light from the scanning lamp shines through the paper making it semi-transparent, picking up the white of the paper behind the black ink of your lineart.
One solution might be to: Try a black sheet behind your white paper with the inked lineart on it.
Another solution might be to:
Saturate your lineart in photoshop using the channels palette.
Select the darkest looking colour channel (RGB) - or (CMYK) if you use this.
Make a copy.
Go to Image, Apply Image.
Paint out any dark spots that appear with white.
Select 'Multiply' - or any of the other choices to make it darker. (You may have to do this a few times).
'Shift' select that layer to bring up a marquee selection.
Turn on the RGB/CMYK layer in the channels palette.
Go to layers palette and create a new layer.
Invert the selection and fill it with black (possibly more than once?)
Finally, set your newly created lineart to, 'Multiply' and don't forget to colour under it.
Alternatively, you might end up doing both.
However, the end result is usually the same: Ta-da. Deep, rich, saturated black.
Hope this helps.