Sir; Full marks to the ever innovative Heinz for coming up with purple ketchup (The Grocer, August 4, p4). Never mind the kids! This is a great idea for adults too. Food has been boring for far too long. Let's have more colour. Why not go the whole hog, and have green bread, red butter and pink carrots? Keep it up, Heinz! J Marsden Harrogate {{LETTERS }}