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I don't know what you mean by "universal indicator". That's a generic term for a mixture of indicators that displays distinct colors over a fairly broad pH range, but without knowing which specific one you're using it's difficult to say.

However, a lot of them are minor variations on Yamada's 1923 patent, so I'd expect that it would probably be somewhere in the greenish part of the spectrum. Exactly where depends on the particular ratios of the various indicator compounds used.

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12y ago

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