Copper sulfate (CuSO₄) is a ceramic material highly prized for its ability to produce vibrant shades such as greens, turquoises and blues in ceramic glazes and decorations. It is a versatile compound that can be used in both transparent and opaque glazes, offering a wide range of decorative possibilities depending on the concentration used and firing conditions.
In oxidizing atmospheres, copper sulfate tends to produce bright, saturated greens, while in reducing atmospheres it can produce duller tones, such as browns and dark reds. Its ability to react with other oxides and ceramic components makes it an ideal material for experimenting with reactive effects and textures.
Copper sulfate can also be applied in techniques such as splattering, direct painting or even as onglaze decoration to add contrasting details. In artistic ceramics, it is often used to enhance decorative details, while in functional ceramics, its use is more restricted due to safety considerations related to its toxicity.
Interesting Fact
Copper sulfate has historically been used in Islamic ceramics to create the famous green tones that adorned tiles and tableware, a style that spread to Europe during the Renaissance.
Helpful Tip
Due to its reactive nature and high solubility, use copper sulfate in small quantities and be sure to test before applying it to large projects. Store it in airtight containers to prevent it from absorbing moisture and always work in a ventilated area wearing personal protective equipment, such as gloves and a face mask.
