In his late 60s at the start of WWII, he was keen as mustard for a second round with the Germans.
Bridget Goodwin, an associate professor at Bond University, says in her book " Keen As Mustard " that about 2, 000 Australian soldiers were used for secret research in experiments run by British chemical warfare scientists with American involvement.
Colman's claim the expression " as keen as mustard " derives from the Keen family and the secret ingredient ( Some information on Unilever's Colman's page ] ), although some English language experts believe that the phrase predates this.
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