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Topic: Eriochrome Black T  (Read 8861 times)

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zzzzz

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Eriochrome Black T
« on: February 27, 2005, 04:41:36 AM »
where does the T from the indicator Eriochrome Black T come from?

Offline Borek

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Re:Eriochrome Black T
« Reply #1 on: February 27, 2005, 06:59:44 AM »
Therea er at least four Eriochrome blacks - A, B, R and T. They are very similar compounds. all have analytical uses. Capital letters are used to differentiate between them; perhaps they are connected with the compund structure but I am only guessing here.
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Offline ATMyller

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Re:Eriochrome Black T
« Reply #2 on: February 28, 2005, 03:03:55 AM »
Eriochrome black T is a compelx aromatic compound used as a metal indicator, printing pigment and in water hardness analysis.
It's blue in protonated form and red in complex form. It's known for ages so it's probably extracted from some plant.
Chemists do it periodically on table.

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