Artificial ageing
Although nothing will age your new stone better than time and the natural ageing process, a similar appearance can be achieved and accelerated by the use of organic and chemical solutions, the photographs below show three popular methods of artificial ageing techniques
Organic compound

The photograph on the left show the product (two days old) before the organic compound was applied, these photographs were taken the same day.
Chemical compound
The photograph on the left show the product (two days old) before the chemical compound was applied, these photographs were taken the same day.
Acrylic compound

This photograph show a run of Golborne balustrade aged with acrylic paint mimicking lichens and mosses.