- None. If you apply that to an object or type, you take off any colour you have applied before. You can see that next to that colour and other ones you have a pencil with a red stroke above it. That means that you cannot change nor delete that swatch from your Swatches palette.
- Paper. This is similar to none, however there is some difference. Look at the bottom portion of the illustration to understand.
I have drawn two boxes, one on top of the other one. The red box is under the other box in both examples. On the left I have applied the None swatch to the box on top. It is transparent but because it is selected you can see its bounding lines/handles. On the right I applied the swatch Paper. You can see that part of the red box is now covered by the paper-colored box on top.
You may ask, "Why is the Paper swatch called 'Paper' and not 'White'?" Because if you are printing on yellow paper for example, you won't see white, you will see yellow. By using that swatch you are telling InDesign not to use any colour. So in actual fact the white box on the right hand side of the illustration isn't on top of the red box, you are actually taking colour off the red box where the two boxes intersect.
Note: if you print on coloured paper also the inks you use will be most likely affected as the colour of the paper will partially show through your inks (it depends on the type of printing you are doing) so they won't look like as though you are printing on white paper.
