Sai Kung Calcium Carbonate Brick

The hexagonal bricks are made with seashell lime, sand from Pak Sha Chau, and dyed with pandan extract.

Composite small seashells were collected from beaches along Sai Kung’s small islets. The contents were cleaned, filtered, and prepared for firing to break down the shells into lime. Sand from the same beaches was sieved for providing a suitable-size aggregate. Culinary pandan was used as a dye and was tested with various colouring methods. The formwork is inspired by the slanted hexagonal volcanic geology of Sai Kung. Different ratios of lime, sand, and water, were tested to create an efficient and stable brick.