Start by matching the pen to the fabrics you label and how often items go through the wash. Look for true black ink that is designed for textiles and offers good washfastness on cotton, synthetics, and blends. Choose a fine or medium tip for neat, legible marks and a secure cap to prevent drying out. Favor reputable brands and check that care instructions are clear and straightforward.

Ink permanence depends on the ink chemistry and the fabric you mark. Choose inks marketed as washfast or colorfast on textiles, and expect cotton and synthetics to respond differently to washing. Test on a hidden area or scrap fabric, then launder as you normally would to confirm the result. If the ink allows heat-setting, follow the manufacturer guidance to improve durability.

Beginner: start with a fine-tipped pen and practice on scrap fabric to build legibility. Pro: prefer pens with a stable tip, fast-drying ink, and consistent performance across multiple fabrics for batch labeling. Keep a small practice swatch and use the same marking location and writing style for clarity. Both types should always test a new item before full labeling.

Store the pen capped and upright in a cool, dry place to prevent drying. Always test on fabric before marking and follow care labels for heat and solvent restrictions. Use on fabrics that tolerate marker inks and avoid delicate materials that may bleed or smear. If the pen dries out, replace the nib or the pen to maintain line quality.

Removal depends on the fabric and ink; some marks can be lightened with a color-safe remover or by repeated washing, while truly permanent inks may be difficult to erase. Always test any removal method on a hidden area first to avoid damage. For delicate fabrics, consider using a removable fabric marker instead of a permanent one. If in doubt, consult the care guidelines for the marking pen.