page_title: Aluminon
hierarchical_section_title: Aluminon
caption_attribution_description: English: When aluminon binds ferric ions (Fe3+), it forms a violet colored lake pigment (an aluminon complex salt). Pigment in the picture is in neutral solution, and was made by combining aqueous aluminon and FeCl3. Source for claims: Clark, RA; Krueger, GL (1985). "Aluminon: its limited application as a reagent for the detection of aluminum species". The Journal of Histochemistry and Cytochemistry. 33 (7): 729–732. doi:10.1177/33.7.3891845.
context_page_description: Aluminon, the triammonium salt of aurintricarboxylic acid, is a dye often used to detect the presence of the aluminium ion in an aqueous solution. Aluminon forms a red complex salt in combination with Al³⁺.
  In addition to its use in qualitative inorganic analysis, aluminon has applications in pigment production. It forms brilliantly colored lake pigments with many metals. The pigments are red in combination with Be²⁺ and Ga³⁺. The pigment is deep purple or reddish-brown in combination with Fe³⁺. Color of a particular pigment in acidic solutions may change: aluminon and Sc²⁺ form red pigments if the solution is acidic, but otherwise the solutions are colorless.
  Aluminon is prepared by reacting sodium nitrite with salicylic acid, adding formaldehyde, then treating with ammonia.
context_section_description: Aluminon, the triammonium salt of aurintricarboxylic acid, is a dye often used to detect the presence of the aluminium ion in an aqueous solution. Aluminon forms a red complex salt in combination with Al³⁺.
  In addition to its use in qualitative inorganic analysis, aluminon has applications in pigment production. It forms brilliantly colored lake pigments with many metals. The pigments are red in combination with Be²⁺ and Ga³⁺. The pigment is deep purple or reddish-brown in combination with Fe³⁺. Color of a particular pigment in acidic solutions may change: aluminon and Sc²⁺ form red pigments if the solution is acidic, but otherwise the solutions are colorless.
  Aluminon is prepared by reacting sodium nitrite with salicylic acid, adding formaldehyde, then treating with ammonia.
caption: Deep purple pigment in a neutral aqueous solution.  Made from aluminon and ferric (Fe3+) ions.
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