Cuprinol Garden Shades Silver Birch 2.5LCuprinol Garden Shades Silver Birch 2. 5L Cuprinol Garden Shades has been specially developed to colour and protect sheds, fences and other garden wood. Its special pigments ensure a rich colour and allow the natural texture of the woodgrain to shine through. It can also be applied on terracotta, brick and stone, bringing our beautiful rich colour into the garden.