Kippaxpete
Well-Known Member
Simple. Historically, vinegar and sugar were used as preservatives in food items such as ketchup, pickles and chutney to avoid food wastage. Therefore, labelling advising consumers to 'refrigerate after opening' is there purely to avoid manufacturers being sued by unscrupulous tossers falsely claiming to have been made ill by their products. Otherwise, products containing dairy or eggs - such as mayonnaise - should always be stored in the fridge after opening.