英语阅读

听力入门英语演讲VOA慢速英语美文听力教程英语新闻名校课程听力节目影视听力英语视频

Bringing Color to Life With Natural Dyes

andyg 于2007-05-20发布 l 已有人浏览
增大字体 减小字体
&raquo Download Audio(mp3) By Jill Moss 2007-5-20 This is the VOA Special English Development Report.

» download audio(mp3)
by jill moss
2007-5-20

this is the voa special english development report.

dyed wool

dye can bring a little color to life. most clothing is colored with dyes. modern, manufactured dyes can be costly. natural dyes from plant and animal products have been used since ancient times. so this week, we describe a natural way to dye wool.

the advice comes from information written by jenny dean of the intermediate technology development group in britain. this anti-poverty group is now called practical action.

there are several methods to put dye onto material. the vat method, for example, can be used to dye wool with onionskins. for this example, use one hundred grams of natural wool. the wool must be clean. leave it overnight in water and liquid soap. then wash it with clean water that is a little warm. gently squeeze out the extra water.

a solution called a mordant is used in the dying process. a mordant helps fix the dye to the material. traditionally, mordants were found in nature. wood ash is one example. but chemical mordants such as alum are popular today. alum is sold in many stores. it is often mixed with cream of tartar, a fine powder commonly used in cooking.

 1 2 3 下一页

分享到

添加到收藏

VOA慢速排行