For shits and giggles, I set a goal of painting 1,000 gouache miniatures, and have subsequently branched out and painted in two other formats (7x10 and 11x14)
The reason for this is that formaldehyde hemiacetals follow other reaction pathways, such as the formation of a less reactive full cyclic acetal catalyzed by the acidity of the DNPH solution and the silica
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This is one of the most advanced units we tested, and it performed well in our floor-mat test, but it'll cost you a pretty penny
I especially like the fact that they can be inserted into different devices