In order to "white-out" a line don't you need to match the line weight as well? I always assumed this so I set up a row of white pens with weights that match my standard progression solely for this purpose. I know using white out exposes weaknesses either in my method or AC's clean-up but that's life. Happily I'm finding AC's clean-up approaching an acceptable point, so for most drawings I've adapted the "reverse drafting" technique of leaving S/Es linked and patching where necessary.
I use an off-white, light gray back ground. That way all lines show including white.
That said I generally agree with your wish. Pure white to pure black and visa versa, as long as the Automatic Pen Color Visibility Adjustment preference is selected. It would also be nice for invisible lines to somehow be optionally or temporarily displayed.
AC25 INT, Mac (home), Win10 (work)
Yes, you read that correctly, we are in the US but use the INT version, because the libraries are better.
Just for some added clarifications, while AC does join walls properly, that does not always translate into having the core composites join properly, as you can see in the attached image.
Here is where the problem is most evidant. First, the drawing without any adjustment just isn't technically correct. The walls have to join properly, but so do the various composite layers, especially the core. In the image provided, the walls do join properly, but not the core composite.
Also, when creating a dwg file for civil/structural, etc, you then have to massage the information in the DWG file so that it appears correctly. In this case, the civil turns off all composites except the core as he/she doesn't care about stone, stucco, siding, etc. As such, the walls do not close properly unless I go into the file and spend hours checking each and every wall. Waste of time.
I can use the proper pen color to make the wall appear as if it is joined in AC, however, I use a black pen for core composite, which when using a black background gets automatically changed to white. And therefore, the white-out pen won't work properly as it appears white and when viewing the plan you can't tell a wall line from a white-out line when the white-out line is covering up part of a wall.
How did this turn from a discussion of non-printing pens into a discussion of composite wall intersections? I must be missing something.
Improvements to the composites are essential. They have already improved substantially over the years but still have a ways to go. Proper clean-up of individual skins in plan is one needed improvement. Others are scale sensitivity and better clean-up in section. It seems that this should be in its own topic rather than under "Pen 91 w/Black Background."
Regarding the white pen issue. I don't understand the reason to use white-out lines. I usually use empty fills with pen 91 as the background color. With a black background (which I rarely use) this looks fine if the Preference is set to use the drawing background as the fill background (rather than the element's setting).
I am curious, what do you use the white-out lines for?