Titan yellow
Encyclopedia
Titan yellow is a compound with formula Na2C28H19S4O6. It is a triazene
Triazene
Triazene, also known as triazanylene, is an unsaturated inorganic compound having the chemical formula N3H3. It has one double bond, and is the second simplest member of the azene class of hydronitrogen compounds, and is not found in nature. It is also the name given to the functional group...

 dye
Dye
A dye is a colored substance that has an affinity to the substrate to which it is being applied. The dye is generally applied in an aqueous solution, and requires a mordant to improve the fastness of the dye on the fiber....

used as a stain and fluorescent indicator in microscopy. It is also used as a reagent for the detection of magnesium. As an acid-base indicator, it changes color from yellow to red between pH 12 and pH 13.
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