Just a quick test to show that Lea Formula 3 that was made 18 months ago performs the same as Lea Formula 3 made three months ago. The 18 month old collodion was not stored in a cool dark place, but left on a shelf in my garage. So I consider it to be real world aged.
As usual, the plates were run using the same silver bath, developer, fixer, and exposure. They are quite close. In person I really can't tell the difference between the two plates.
Lea Formula 3 is perfect for people who don't shoot a lot, or want a consistent collodion that doesn't go bad. I'll continue to test this collodion to see how long it continues to produce good plates. More than two years? I think it's very possible
This is what 18 month old Lea Formula 3 looks like!