I have to say I was a strong supporter of OS inks when they were available. Some of them were really great. The Lewis Carroll Queen's Rose is an amazing rose color, not pink, not red. Blue Merle was originally a very unique and wonderful color, but it's properties in the bottle are not shelf-stable. I have three different bottles of Blue Merle and none of them are the same, and they are not what they were when originally purchased. And one of them is basically just gray, and I hate gray inks.
My bottle of Walt Whitman, never was the deep dark green advertised on the box. I thought, oh, it's trying to be El Lawrence, because it was this dirty green-brown. I filled a pen with it a month or so ago, and wondered "where's the green?" It wasn't even an interesting brown.
I really wanted to like OS inks, and their handling was fine, often with good shading, but I don't believe the colors are shelf-stable. All my inks are stored in their boxes, and those boxes stored in a closed bigger box. So no light has effected these inks. The formulations of these inks needs improvement, imo.
Mention has been made of IG inks. I personally have no interest in IG inks. I bought one of KWZ IG inks, and it's certainly fine, but it just doesn't move it or interest me. Permanence isn't a quality I'm looking for, and if I want that I can use Sailor's Kiwa-Guro nano-pigmented ink. Or something else on the market, I don't need an IG ink.
I have plenty of inks to keep me happy from Noodler's, KWZI, Sailor, MB, even though there certainly are very good inks from other makers.
I wish the maker of OS inks success in whatever field of endeavor he has worked so hard in college to achieve.