iron mould

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Noun1.iron mould - a spot caused the staining with rust or inkiron mould - a spot caused the staining with rust or ink
discoloration, discolouration, stain - a soiled or discolored appearance; "the wine left a dark stain"
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References in periodicals archive ?
Analysis shows that the stains are in fact iron mould from deposits of iron in the washing water rather than from blood.
The shoes manufacturing plant and the iron moulds (dies), which are used to cast shoes according to the desired design and size, are mostly imported from other countries, particularly China.
For preparation of plates, iron moulds were fabricated (Fig.1) and that moulds a thin layer of PMMA powder was layered and then polypropylene mesh was added.