I'm struggling with something that shouldn't be this difficult!
I'm laying-out a white-only T-Shirt logo (to go on a dark-green T-shirt)
For the sake of simplicity, let's say I have two ovals with no fill, just a white stroke. A small oval overlapping (on-top-of) part of the edge of a larger (underneath) oval. I
Any advice on how to 'hide' the line that's 'behind' the top object?
Bear in mind that 0% CMYK means no ink.
Therefore draw your ellipses with 0% CMYK fill and 100% K stroke.
Tell your printer that black in your drawing is to be printed with white ink.
There’s no need to scissor anything or anything else so complicated.
Think in separation plates, not colours.
Excellent point, Sir! I've never submitted this type of artwork before; I'm not sure that would have occurred to me!
I'm not sure I understand your point about not needing to scissor anything, though...
But he's got no fill to mask the line
But he should have.
That’s why I told him to use white ellipses with black strokes.
Just put one ellipse on top of the other and the white (no ink) fill will do all the necessary masking.
The colour of the substrate is immaterial and so is the printing method (silk screen or transfer but not ink jet).
The only things the printer needs are one separation film and some white printing ink.
Actually, I'm not completely sure yet.
Steve's answer assumes screen printing with a single opaque white ink. It won't work if printing to non-opaque composite transfers, or cutting from aplique vinyl, or if you're going to import the two-ellipse artwork for combination with other artwork.
Since you don't know:
1. Draw the two circles with a stroke color and a fill color (ex: black Stroke, white fill) on both.
2. Apply the desired stroke weight.
3. Object>Path>Outline Stroke.
4. Pathfinder palette: Merge.
5. White pointer: Select the two inside regions and delete.
6. You now have a single Compound Path; no overlapping objects, and actual "holes" where you want the substrate to show through. Apply whatever fill color (white, etc.) you need.
But bear in mind what has already been stated: White, unless defined as a Spot Color, does not "print." Think in terms of inks, not in terms of "color". In a program like Illustrator, "white" normally means "no ink." And you always have to know what printing method you are designing for.