ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Iron test. Potassium thiocyanate solution (colourless) being added to a solution of iron (III) ions (yellow). As the potassium thiocyanate solution is added, a blood-red colour results. This colour change can be used to indicate the presence of iron (III) ions in an unknown solution.
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