A latent ambiguity may be supplied by proof; for what arises in ambiguity from an extrinsic fact is removed by proof of the fact.

Explanation

Where an instrument appears clear on its face but becomes ambiguous when applied to the facts, extrinsic evidence may be admitted to resolve the doubt.

Where this applies

• The contract looks clear on paper but when applied to the actual facts it becomes ambiguous.
• There's a hidden ambiguity that only shows up when you try to apply the document to reality.
• Outside evidence should be allowed to clear up an ambiguity that isn't visible on the face of the document.

See also

• 10.3.1 An ambiguous answer is to be taken against him who offers it.
• 10.3.5 A patent ambiguity cannot be cleared up by extrinsic evidence.