It is impossible to predict what will happen with every combination when you mix fountain pen ink to create custom colors. Once Alan mixed Noodler’s Year of the Golden Pig and Noodler’s Georgia Peach to try and get a golden-yellow highlighting ink and it created a gel! This result certainly would have messed up the ink flow in any pen! To save you from some unexpected results, there are a few fountain pen ink mixing combinations that you may want to avoid.
When mixing blue-black fountain pen inks it is good to be cautious since some blue-black inks, especially older formulas, contain iron which makes the ink acidic and corrosive to fountain pens. Mixing some blue-black inks can also cause clogging.
Mixing inks can change or neutralize any special properties that they may have. For example, Noodler’s “bulletproof” inks (waterfast, fade resistant) when mixed with conventional inks loose their special “bulletproof” properties. Noodler’s Polar Blue or Polar Black inks may lose some of their freeze-resistance when mixed with regular inks, however, we do not live in a cold enough location to test this out. Does anyone have experience with this?
The formula of Noodler’s Baystate Inks is styled after vintage inks and has a different pH than all other Noodler’s Inks. This ink was not made to be mixed with any other ink except for other Baystate colors! In addition, the Baystate inks each have slightly different properties. Baystate Blue is waterproof, but Baystate Concord Grape is only partially water-resistant and Baystate Cape Cod Cranberry is not waterproof at all. These inks are a favorite of some writers because they have a very high color intensity and look dramatic on certain paper grades, so it is nice to know what their limitations are.
Do you have any fountain pen ink mixing nightmares or warnings that you wish to share with us?