Talk:Salad cream

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Does anyone know if salad cream lasts noticeably longer than plain mayonnaise and for what reason this might be? My grandmother has always kept open salad cream bottles out of the fridge, and they seem to last for ages. However, I'm sure mayonnaise would go off in less than 24 hours. Could it be the vinegar maybe? If anyone can confirm that it lasts longer and give an explanation I wouldn't mind adding it to the article. Daniel Medina 08:02, 8 September 2005 (UTC)