they put a leaf in boiled water
silk comes from the cocoons of silkworms
produced by fermenting rice, fruit, and honey.
they poured a mixture of snow and saltpetre over the extirors of containers filled with syrup.
high firing glazed ceramic wares
created by combining saltpetre and sulfur with charcoal
melting iron to make steel
words written on oracle bones
made from fish nets, tree bark, and bits of broken rags
water dripped on a wheel that made a full revolution every 24 hours