Why I use sponging
As you can see from the picture, sponging can make a dramatic difference in the appearance of a design. I use a round sponge for most of my sponging because it doesn't leave harsh edges. One of the secrets to successful sponging of edges is to have a light touch.
One of my favorite inks for sponging is Ranger's Archival Coffee, but that does not mean that that is the only ink that I use. It depends on the project and what colors I want to accent. I frequently use a very light brown on the very edges of white labels. This is to make the label stand out from the background, especially if it is light.