I always etched boards in a solution of ferric chloride, but many people use hydrogen peroxide and citric acid because of the availability and cheapness of this method. I decided to try it too, and in general it turned out well, considering that this is the first pancake. The first pancake turned out not lumpy, but with small nonmordants, but I can definitely recommend this method as a good alternative to ammonium persulfate and ferric chloride.

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