It's been around forever. Looking Glass sells to lots of students, and this is a convenient item. Just
regular 76, premixed. But here's the catch with all unbuffered 76 formulas, including Kodak powder
version: when it's freshly mixed it, the developer activity changes, typically for a about a week, until
it reaches a plateau; but how long that plateau is, is difficult to detemine. Some say a month, some
six months. It actually gets more active over time, until failure from oxidation. So for critical work,
best to use either freshly mixed, or between 1 wk and a month, if stored in full glass bottles. For
nominal use, you can bend these rules. But 76 is infamous for last-minute surprises when you're on
the border. Otherwise, Lauder quality is good.