"...Song's chapters cover the growing of grains and their preparation; clothing materials; salt technology; sugar technology; ceramics; bronze casting; ships and carts; iron metallurgy; calcination of stones; vegetable oils and fats; paper making ; metallurgy of silver, lead, tin, copper, and zinc; military technology; vermillion and ink; yeast and pearls and gems'-- Cf. Wilkinson, Chinese History, a manual, pp.667-668.