Potassium Carbonate Powder (Potash, Pearl Ash, Salt of Tartar)

Premium Potassium Carbonate (K₂CO₃) – High-Purity Pearl Ash, Fine White Powder – The Pure Potash Powerhouse for Brilliant, Glossy Glazes & Specialty Glass

Step up your glaze game with potassium carbonate, also known as pearl ash — the classic, soluble source of pure K₂O that delivers unmatched fluxing power without unwanted companion oxides. This bright white, hygroscopic powder (typically 99%+ purity) is the secret behind vibrant colors, deep gloss, and fluid melts in ceramics and glass formulations.

Why choose our Potassium Carbonate (Pearl Ash)?

• Provides oxide-free K₂O — the only material that supplies precise potassium without bringing along alumina, silica, or other fluxes from feldspars — perfect for fine-tuning recipes, adjusting expansion, or creating specialized alkaline glazes.
• Produces brilliant, glossy surfaces with excellent flow and clarity — ideal for high-fire stoneware, porcelain, and mid-range glazes where shine and saturation are key.
• Enhances color development dramatically — intensifies and brightens hues, especially copper (yielding stunning green-yellow tones), cobalt, chrome, and iron for vivid, jewel-like results that pop.
• Acts as a strong flux to lower melting points, promote smooth vitrification, and encourage fluid, glossy melts over a wide temperature range — from medium to high-fire applications.
• Versatile in ash glazes and wood-fired effects — integrates beautifully with natural ashes, silica, and other materials for unique, smooth-melting surfaces with character.
• Boosts specialty glass production — increases refractive index, transparency, clarity, chemical durability, and mechanical strength in optical glass, lead crystal, potash glass, TV screens, monitors, labware, and artistic glass sculptures.
• Used in frit manufacturing as a controlled potassium source for consistent batching.

Key Properties at a Glance:

• Chemical formula: K₂CO₃
• Appearance: Fine, bright white powder (hygroscopic — absorbs moisture from air)
• Highly water-soluble — dissolves readily for slips, but requires careful handling in glaze suspensions to avoid settling issues
• Decomposes during firing to release K₂O — the active, powerful alkali flux — plus CO₂ for clean burnout
• Stronger gloss and brighter colors than sodium-based fluxes, with slightly less crazing risk but still high expansion potential

Whether you're chasing eye-catching glossy glazes in studio pottery, pushing vibrant color responses in high-temperature work, experimenting with ash-glaze magic, formulating optical or artistic glass, or producing frits with precision potassium control, this premium potassium carbonate delivers exceptional, reliable performance.

Handle with care — it's strongly alkaline and hygroscopic (store sealed, dry), use gloves, mask during mixing, and ensure good ventilation to manage dust and solubility.

The pure potash choice for when you need potassium's brilliance without compromise. Add this essential flux to your palette today — unlock glossy perfection, saturated colors, and crystal-clear possibilities!

Available in studio sizes and bulk for serious makers and industry. Order now and feel the pearl ash difference in your next firing!