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Topic: Change liquid color from brown to clear  (Read 3198 times)

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Offline opwierde

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Change liquid color from brown to clear
« on: July 08, 2007, 05:24:44 PM »
First post and immediately I need help :-)

To symbolically demonstrate the neutralization of a waste water stream I want to have a transparent vessel of water change from brown to clear after adding a clear liquid. I have found some indicators that will go from yellow to clear that I will use in a pinch (p-nitrophenol) but I would prefer brown. Any tips? Maybe with potassium iodide?

tia, Peter
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Offline Yggdrasil

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Re: Change liquid color from brown to clear
« Reply #1 on: July 09, 2007, 12:29:23 AM »
Maybe you can have a mixture of indicators which looks brown at one pH but clear at another pH.
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Offline pantone159

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Re: Change liquid color from brown to clear
« Reply #2 on: July 10, 2007, 02:58:30 AM »
What about an aqueous solution of iodine (or tincture of iodine), which is brown, then add sodium thiosulfate solution (clear), the iodine is reduced to iodide which is colorless.
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