Ink replacements for the brush-tipped Pentel Poket markers Instructions: Remove the lid and unscrew the body. Firmly press the narrow end of the cartridge in order to insert it in the tip. Put the body back in place and tighten it firmly. Keep the marker in a vertical position with the tip down until the ink descends to the brushes, then do test strokes until the ink flows. Note: - Permanent ink, it won’t come off clothes.- The ink can be affected by extreme temperature or air pressure changes.- If the bristles are obstructed with dry ink, remove the tip and rinse it with warm water.