I am a huge fan of Chesterfield ink, and before I consider buying an ink from a different company I always look to see if I can purchase a similar color from Chesterfield first. (I realize that Chesterfield is just a repackaged and rebranded Diamine, but Chesterfield inks come in spiffy Nalgene bottles, cost far less than Diamine, and have more sizing options. They may be the same ink as Diamine, but I think of them as a separate entity.) The only other ink company that I use as often as Chesterfield is Rohrer & Klingner. With these two companies covering the vast majority of colors and options (both have iron gall inks, permanent document inks, and a wide variety of colors) I rarely see the need to go elsewhere for my inks. I have an ink or two from other companies and I have a hand full of samples from other companies, but to be perfectly honest I always end up coming right back to my big two.
This realization really hit home when I realized that I will buy a full bottle from either Chesterfield or R&K without first sampling the color, but I will not even consider buying ink from another company without trying a sample first. As it turns out, I am a loyal user of these two inks and I didn't even know it. So, my question is: how many folks out there find themselves loyal to certain brands of ink? What is it about those inks that keep you coming back? I am curious to know if I am alone in sticking mostly to one or two brands or if there are others like me out there.