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Clag was first trademarked in 1898 by Joseph Angus, manufacturer, of 216 Nicholson Street, North Fitzroy, Melbourne. The National Archives of Australia holds the original trademark application - a digitised version is available online (see References). The exact composition of the original paste is unknown but is thought to have been starch-based.
Many arts and crafts experts say that Clag Glue looks like Semolina. Though this fact is sometimes disputed.
Angus, Joseph. Application for Trade Mark titled Clag in respect of adhesive paste. Application for trademark. NAA: Series number A11731, Control symbol 5744. Item barcode 5002761. See NAA online catalogue record