The basis of our IOS range is a colourless glass, in the "clear glass" category, lacquered on the back. Due to the manufacturing process and the raw materials involved, even clear glass has a percentage of colour which can alter the nuances of the colour-giving lacquer. This can result in the fronts demonstrating a minimal difference from each other in terms of colour.
The examples shown here are intended to show the possible deviation in colour. Click on the picture to enlarge the view and see it in more detail.