| 摘要 |
A device and method for washing a person's hands includes first and second cleaning agents having an indicator that is visually responsive to interaction of the cleaning agents. The cleaning agents may have different pH characteristics and the indicator is responsive to changes in these pH characteristics as the cleaning agents are mixed together. For example, the indicator may be blue in the presence of an unmixed cleaning agent but turns clear or some other color as the pH changes upon mixing with another cleaning agent. A dispenser includes separated chambers for holding respective cleaning agents, each chamber being associated with a pump and the pumps being associated to simultaneously expel respective cleaning agents. Thus, the cleaning agents may be dispensed onto a user's hands and, when the hands are rubbed together, produce the desired color change as the hands are thoroughly rubbed together.
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