This is ideal after you have a lot of pens and refill ink - I suggest
getting 2 copies - one for the Markers and one for the inks.
I thought I had kept track of my colours and found that I was way out - so now I have brought my collection up to date.
This chart is extremely helpful. It's a great way to keep track of the colors I have and the ones I still need. It also makes it easy to match the colors for projects. The only downfall is that the chart doesn't provide the color names.