Valenta Solution

Eduard Valenta, an Austrian chemist, undertook modifications to the original composition by decreasing the iron and ammonia content, while simultaneously augmenting the concentration of citric acid in FAC (Ferric Ammonium Citrate). Consequently, the green hydrated variation now consists of approximately 14.5-16% iron, around 7.5% ammonia, and 75% citric acid.

This Valenta formula can be applied appropriately (please refer to the quick guide) to any surface capable of absorbing the solution. Not only resulting in Prussian Blue, it also yielding a much cleaner finish overall.