Why does Wang's black paper fan have the reputation of "one and a half umbrellas"?

Wang Hei paper fan, the fan surface is made of Lin 'an submerged mulberry paper, Zhuji persimmon paint and Fujian coal, which is refined through 86 processes. Put it in the hot sun, soak it in cold water, boil it in boiling water, take it out and dry it for more than 10 hour. And a good fan. This kind of fan can not only cool off the heat, but also keep out the sun and rain, so it has the reputation of "half an umbrella". Thank you for your question. I hope it helps your problem.