iron mould

Meanings

1. 1
   noun

   a yellow, brown, or reddish stain on cloth, paper, or a similar material caused by rusty iron or an iron-based ink

   Damp storage left spots of iron mould across the old linen and several pages of the ledger.

An English compound of iron + mould, documented since the early modern period for discoloration caused by iron, rust, or iron-based ink. Iron mold is the standard American spelling.

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