As in the alcohol-based product line, the blender in this line of markers is necessary for blurring ink and creating various effects, if you do not use a water brush.
Unlike using a brush and water, it does not blur too much and is very useful when you want to get a precise shade but cannot make paper too wet.
The blender perfectly mixes colors without water and does not change the shade. When you mix using a marker, the color will be more intense and may lose its purity.
Besides, if you apply two or more marker colors to the nib, you can use the blender to get new shades.
You can use the blender for calligraphy to create a gradient that you can adjust by adding more color to the nib.