| 摘要 |
The present invention relates to using an aerosol, mist, spray, liquid or semi liquid delivery system for the reagent solution containing the indicat or or marker. This system comprises a reagent containing the indicator or ma rker that produces a color in the presence of reactants such as basic compon ents, in a functional fluid. The indicator is e.g. an acid/base indicator, a metal indicator or a redox indicator.
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