Their interiors and exteriors correspond perfectly. The tool has not been imagined that could have been inserted into their long necks to shape the perfect, rounded bellies. Smooth and glossy, these vessels bear no trace of tool marks. More details in the Geopolymer Library . The properties of geopolymeric binders and cements have been evaluated by several renown international institutions, their quality proven by numerous tests conducted according to the most severe ASTM and DIN Codes.
Art crafts are very sensitive to fashion.
Visit this page to see how a re-agglomerated limestone looks like, by using a technic similar to the Egyptian Pyramids. You will have to think if it is a natural or an artificial stone.