The Ink blending tool from Ranger is ideal for the use of blending techniques. The tool gives you a better control for the placement of the ink and prevents your fingers from being full of ink.
Each foam has a thin layer of fabric on 1 side. Attach the foam to the tool on the fabric side. Dab the foam in the ink and apply the ink to the paper with circular movements. Work from the outside in, so that the color is very lightly visible in the middle. When using multiple colors, always be the first to start with the lightest color and build up to the darkest color. Use a separate foam for each color