Bureau Direct has an excellent guide to choosing fountain pen inks on their blog. The guide starts with the basics like color and price, which size bottle to buy and purpose of the ink (does it need to be waterproof? Fast drying?).
Then they take you through more advanced options like the three Sh’s: Sheen, Shading and Shimmer. Beyond that are other factors to consider like complexity and packaging.
This informative guide walks you through all of these factors step by step, giving you lots of things to consider. Several inks are suggested in every category. We of course are pleased the Herbin inks are frequently recommended in multiple categories!
What ink characteristics are most important to you? What do you look for when choosing inks?