At most, a faint wine-purple color in the first beaker, indicating a trace of 2,4-D acid.2. A deep wine-purple color in the second beaker, indicating most of the original 0.10 mg. of 2,4-D acid. 3. A pale wine-purple color in the third beaker, indicating only a small portion of the original 0.10 mg. of 2,4-D acid. 4. No wine-purple color noticeable in the fourth beaker, indicating the absence of 2,4-D acid. 3 (1945).
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