Arabic gum and tragacanth gum
Arabic gum and gum tragacanth are natural, water-soluble gums used in ceramics to act as binders, stabilizers and thickeners in the preparation of glazes, engobes and pigments. When mixed with water and ceramic colorants, these gums improve the adherence of the particles to the surface of the piece, preventing them from spalling during the stages prior to firing. Their use is particularly valuable in decorative techniques such as fine brushing, the application of decals and the elaboration of hand-painted details on the raw or bisque fired surface.
Gum Arabic, extracted from various species of acacia, is known to be more fluid and easily handled. Its main virtue is to improve pigment fixation, ensuring uniform application and preventing particles from dispersing. Gum tragacanth, obtained from species of the genus Astragalus, generates a more viscous and stable mixture, useful when greater density, application control or thicker layers of material are required.Interesting Fact
Arabic gum has been used since ancient times not only in ceramics, but also in watercolor painting, bookbinding, pharmaceuticals and as a food additive. This versatility demonstrates its effectiveness as a natural emulsifier throughout history.Helpful Tip
Mix the arabic gum with the pigments just before applying them, thus ensuring optimum consistency and easy handling. In the case of gum tragacanth, add small amounts to adjust the desired viscosity, as its thickening effect is more pronounced.
