Coloured glass aggregates provide a range of colours that are not possible using mined aggregates.

The glass aggregates are completely coated on all sides , the glass possesses a clear matrix , so even if the top coating is worn away , the underlying colour on all of the facets of the glass reflect through the clear matrix , much like a prism .

Added to this, the glass filters out the U/V to the underlying sides thus adding to the longevity of colour retention.