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Where can you buy soda ash?
Although you can buy washing soda in the grocery store, this is usually advised against, because some US brands in the past were known to contain optical brighteners, salt, and/or fragrances. However, Arm & Hammer brand "Super Washing Soda" does not now contain any additives, though you must use a larger quantrity due to its greater hydration level (see above). A better source is a swimming pool supplies store, or a hardware store that carries some pool supplies, which will carry pure sodium carbonate (a popular brand is pH Up), sold for the purpose of increasing the pH of pool water. This is typically cheaper than mail-ordering from a dye supplier, and just as good. Beware of suppliers that try to sell you sodium bicarbonate instead of sodium carbonate; bicarbonate is much less basic (it has a lower pH), and will not work for most dyeing recipes.
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