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I've seen half-way points with indicators in chem lab although only when adding base or acid drop by drop. They do change very quickly, but I think that in principle (because the indicator is in equilibrium between two different forms) that there is a point where half of the indicator is in one form and half is in the other. In such a situation (which may be difficult to achieve) light of both colors should be reflected by half of the indicators, and an intermediate color should be observed.
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