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| a preparation containing an insoluble dye converted by reduction into a soluble leuco base, or a vessel containing such a preparation |
| the quantity of product formed by the interaction of two or more substances, generally expressed as a percentage |
| sulfurous acid
A colorless solution of sulfur dioxide in water, characterized by a suffocating sulfurous odor. It is used as a bleaching agent, preservative, and disinfectant. Chemical formula: H2SO3. |