SODA ASH – PH ADJUSTER & SCOURING AGENT
Chemical name: Sodium Carbonate | Grade: Textile | Use rate: 3 – 10 %
No natural-dye studio is complete without soda ash. This alkaline powder raises the pH of dye baths and indigo vats, scours cotton and other cellulose fibres, and brightens plant yellows such as reseda by raising the pH.
Uses
• Boost pH in indigo, woad or fructose vats
• Scour cotton, linen, hemp and bamboo before mordanting
• Intensify weld yellow
• Balance acidic dye baths when needed
In a nutshell
• Material: Sodium carbonate (soda ash)
• Function: pH enhancer & cellulose scour
• Dose: 30–100 g · L⁻¹ (3–10 % owf) dissolved in hot water or dye liquor
• Compatibility: All natural dyes; indigo & woad vats
• Packaging: Resealable moisture-proof pouch
• Safety: Wear gloves & mask; store cool, dry, and away from acids
Basic directions
Dissolve the required soda ash in hot water (or directly into a hot dye bath) at 3–10 %. Stir until clear, then add to the dye pot or fibre scour. For indigo vats, add soda ash after the pigment to adjust alkalinity before introducing a reducer.
Safety & storage
Soda ash is strongly alkaline. Avoid inhaling dust and protect eyes and skin. Store sealed and dry; keep away from children and acids. Dispose of effluent according to local regulations.
Looking for complementary auxiliaries? Pair soda ash with our Natural Indigo Powder or Indigo Kits for a complete dye setup.
