Kung Futrust people a day, he found that the powder made of raw materials nitrocellulose dissolved in alcohol, then coated in its objects, dried fruit and be able to form a transparent membrane.

• 功夫不负有心人，一天，他发现做火药的原料硝化纤维在酒精中溶解后，再将其涂在物体上，干燥后能形成透明而结实的膜。