This test paper is used for the rapid detection of Iron ions (Fe₂⁺ and Fe⁺). In contrast to Dipyridylpaper it reacts with Fe(II) as well as Fe(III) ions. For the specific detection of Fe(II) please use Dipyridylpaper.

• Colour change: Yellow-white to red-brown

Limit of sensitivity: 10 mg/L Fe₂⁺ or Fe₃⁺