These tapestries are made of the materials silk and wool.

VOA: special.2010.02.03

It says the price index contained this amount of beef, this amount of sheep wool, this amount of sole leather, and this amount of corn; that was the first consumer price index ever used for financial contracts.

指数中包括这些数量的牛肉,这些数量的羊毛,这些数量的鞋底皮,这些数量的玉米,这是在金融合约里出现的,第一个消费者物价指数

耶鲁公开课 - 金融市场课程节选

"Having to shear the sheep for wool is actually very costly and labor intensive.

VOA: special.2009.08.03

The wool must be clean. Leave it overnight in water and liquid soap.

VOA: special.2010.08.02

It produced the same results as tests using wool sheep and horses.

VOA: special.2009.08.03

Place the wool into the dye and heat the mixture.

VOA: special.2010.08.02

Once the dye cools, remove the wool and wash it.

VOA: special.2010.08.02

Next,add the wool and place the mixture over heat.

VOA: special.2010.08.02

After it cools, remove the wool and wash it.

VOA: special.2010.08.02