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CMC Gum Powder- 1 lb.
CMC is generic and refers to organic sodium carboxymethylcellulose. Additions of 1.5% to any dry batch of glaze will make it brushable. Gums are used in ceramics to harden unfired ceramic glazes for safer handling of the ware. Highly fritted glazes (lacking clay content) used in factory settings benefit greatly from the addition of gum. Gum additions are often unnecessary if the glaze has natural hardening properties (i.e. from 20% or more clay). Gum is an important addition to stain mixes that are applied over-glaze by stamping or painting. Gum can act as a suspending agent by virtue of the fact that it thickens the slurry. Depending on time, temperature, and pH, gum can be attacked by microbes or molds. If this happens store in a cooler place, make smaller batches, adjust the pH to make a less friendly environment, or add an antiseptic (i.e. NaN3). Many brush on glazes use CMC and can have a shelf life for this reason. (Courtesy Digital Fire).
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