Natural Purple Food Colour
While not the first colour we think of, the colour purple is found widely in foods, particularly fruits. Our first thought may be red/purple grapes, but there are many other 'red' fruits which actually have more of a purple shade such as plums, elderberries and blackcurrants.
The colour purple is associated with a sweet taste, meaning it can be used to boost a sweet perception without the addition of sugar itself. Purple is predominantly used in confectionery and beverages applications, though may required for example in a plum sauce.
Natural purple food colour is usually achieved using grape skin extract, which is recognised as a safe food colourant, however there are others which can be used including Elderberry and Aronia Juice.