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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 … read more

A few years ago I began an aging study on four cadmium free collodion formulas to see how fast they age. I have data for some of the formulas at various times, but I wanted to do a more controlled ex … read more