Coloured jars add a touch of glass to candles, flower arrangements and for table arrangements. Ball Heritage Collection jars have the colour in the glass itself which allows you to use the jars for standard preserving applications without losing the quality of the colour. Other coloured items are generally a painted glass. Bormioli Rocco paint is food safe and only applied to the outer surface of glass. Be aware of Chinese copies of coloured glass as the paint is often not food safe and can come off if the glass is washed or cleaned.