Crystals on Silica Gel. The top image shows a microphotograph of sodium thiosulfate appearing on the surface of silica gel (magnification ca. 15-fold) and the bottom image shows a microphotograph of copper(II) sulfate crystals on silica gel (magnification ca. 15-fold). For more details see "Spectacular Breeding of Crystals on Silica Gel" by Ryszard Piekos and Jacek Teodorczyk.
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