SKU: AD100 Chartpak® AD® Marker 100 Set, 100 Markers The largest set of colors in the AD Marker set range has four caddies holding 25 markers each. Blend and create highlights and low lights with this expansive set of color families. Chartpak's original xylene AD® Markers properties are unlike all alcohol-based markers common to the marketplace, and while they are compatible with one another, they perform very differently. They won't smudge alcohol-based pens including fine liners, they also work well over ballpoint pens and technical pens. To mix a custom color, apply the marker colors to a plastic film like acetate, pick up the marker color and mix them with the Colorless Blender (sold separately) as you would a paintbrush.