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Use "washing-soda" in a sentence
"Then pour down the washing-soda solution; then pour hot water down again."
"Addition of washing-soda and water-glass (sodium silicate) changes the electrical polarity of the clay particles so that they repel each other and as little as 50% addition of water will make the clay into a slip."
"Because of the formation of soap and the possible stoppage of the drain-pipe when washing-soda is used, kerosene is advised."