The 39 Clues Wiki
The 39 Clues Wiki

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The subject of this article appears in The Maze of Bones.

Iron Solute is one of the 39 Clues that make up Gideon Cahill's master serum. To unlock this clue, one must add the 6 cards from The Maze of Bones.


Amy and Dan Cahill discovered that the piece of paper Grace Cahill gave them has the Clue after all. RESOLUTION was the answer to the missing word. Dan solved the anagram, discovering the clue IRON SOLUTE.


The Cutscene shows exactly the same paper that was given to Dan and Amy.The letters in the RESOLUTION go out and go in another place and forms the word Iron Solute.


The key on the cards that form the card combo for this Clue contains a bone.

Card Combo

Card1.jpg Card2.jpg Card3.jpg Card4.jpg Card5.jpg Card6.jpg

About Iron Solute

Iron solute is used for many things. It can be used for metalworking and chemistry.

The formula for iron solute is Aluminum Alloy Solution (AAs).


  • In the book, Amy says it is an ingredient for ink.
  • "Solute" means "dissolved in water" so "Iron solute" can be written Fe (aq).
  • Grace Cahill wrote RESOLUTION as an anagram to it.

    The Iron Solute Symbol

Iron before it is liquified into Iron Solute


The 39 Clues Clue 18