Selecting the correct ink is the most critical factor in marker procurement. Alcohol-based markers are the industry standard for professional design and illustration due to their fast-drying properties and superior blending capabilities. For educational or office settings, Water-based markers are preferred as they are odorless, non-toxic, and do not bleed through paper. If the application involves non-porous surfaces like glass or metal, Oil-based permanent markers are essential for their waterproof and fade-resistant qualities.