Platinum Carbon Ink is a renowned permanent waterproof pigment ink designed for fountain pens, ideal for documents, drawings—including line and wash—and versatile everyday applications. Due to its ultra-fine carbon particles, this ink can dry and clog fountain pen feeds if not managed properly. It is recommended for pens used daily; if a pen will remain unused for more than a few days, thorough flushing of the pen and converter is essential to prevent damage using distilled water.