MadSci Network: Chemistry

Re: How to safely turn clear water to black.

Date: Tue Sep 1 15:07:47 2009
Posted By: Luis Sojo, Faculty, Chemistry, Simon Fraser University
Area of science: Chemistry
ID: 1247851140.Ch

Hi Michael,

The only one taht comes to mind and it rather benign is the use of iodine 
and a bit of startch:

The resulting statch-iodine complex is black to blue-black:

I2 + starch --> a blue/black complex 

So means that you 'll have to add a bit of iodine to the water (can deg 
this at a drug store) and them sprinkle a bit of starch (magic dust).  
You'll probably play around with the amounts and concentrations.

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