1火烧法1)将纸袋点燃后,纸袋变成灰但形状不变,颜色成黑色,只是比原来小了些,可用手拿起来而不破碎。为木浆纸做成的袋,质量上乘。2)纸袋点燃后,从中间开口裂碎,袋燃完后仍有形,成黑色,但袋中间有裂口,而且很不整齐的口又裂了很多小横向口,这种袋是用半木浆纸做成的袋,质量中等 1 fire method 1) After the paper bag lit, the paper bag becomes gray but the shape of the same, the color into black, but smaller than the original, can be picked up by hand without breaking. Made of wood pulp paper bags, high quality. 2) After the paper bag is ignited, it is cracked from the opening in the middle. The bag is still shaped and black when the bag is burned, but there is a gap in the middle of the bag, and a lot of small transverse openings are cracked in the bag. The bag is made of half- Paper bag made of medium quality