Copper Salt Crystals. From copper vitriol5, the most blue in the traditional group of verdigris made for ema handmade watercolors. These copper crystals crush and grind well in a mortar and pestle for adding to additional watercolor or as a collectible specimen. Each vial is 6mL in size. The crystals take four months to develop and are toxic. Use with caution. A mask is required if you are grinding the salts. Finger tip gloves can be worn when painting if you are allergy or environmentally sensitive. Otherwise always keep a damp hand cloth beside your work to keep your hands clean. Professional fine handmade pigments.
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