If you use deteriorated ink, the following consequences may occur.

In terms of writing, deteriorated ink may cause the pen tip to clog. Because the sediment or flocs produced by deterioration will clog the ink outlet channel of the pen tip, making writing unsmooth and causing ink interruption.

In terms of damage to writing tools, these sediments and other impurities may corrode the pen tip. For example, for a fountain pen, it will affect the smoothness of the pen tip and shorten the life of the pen tip.

In terms of writing effect, the color of deteriorated ink may change, and the expected writing color effect cannot be achieved. If used for printing, it may also clog the printer nozzle, damage the printer, and the printed handwriting will also be blurred or uneven in color.