Zebra Mildliner - 5 Pack - Broad Chisel 4 mm

No, the Zebra Mildliners are not refillable.

While the ink is water-based, these pens are not designed for extensive watercolor techniques. The ink may blend slightly, but they are primarily for highlighting and underlining.

Yes, the dual-tip design makes them suitable for calligraphy and hand lettering. The broad tip is great for thick strokes, and the fine tip works well for details.

The Mildliners work best on smooth paper. Thicker paper is recommended to prevent bleed-through. Test on your paper to ensure the best results.

If the tips get clogged, gently wipe them with a clean, damp cloth or paper towel. Avoid pressing the tips too hard as this could damage them.

The colors are not specifically designed to be lightfast. Exposure to direct sunlight may cause them to fade over time.

It is not recommended to use these pens on fabric. The ink may not be permanent and could bleed or wash out.

Ensure the pen is stored horizontally. Check that the tip is clean and free of paper fibers. Try gently pressing the tip on paper to re-initiate ink flow.

Use thicker paper. Allow the ink to dry before touching it. Try using a lighter touch when highlighting or underlining.

Test the pen on the specific paper you're using. Color appearance can vary based on paper type and absorbency.