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poyoro木蟲(chóng) (文壇精英)
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【Discussion】anyone could tell me the reasons
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» 搶金幣啦!回帖就可以得到:
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榮譽(yù)版主 (文壇精英)
銅蟲(chóng) (職業(yè)作家)
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植物中含有纖維素、木素和色素。在造紙過(guò)程中,將植物莖桿(如稻草)經(jīng)過(guò)堿煮,木素和色素溶于堿液中,被水洗除去,但是難得除干凈,紙漿里面仍含有少量的木素和色素。這些木素和色素在 陽(yáng)光和空氣的作用下,逐漸發(fā)生了變化,使得紙變 ; 黃變脆。 Plants contain cellulose, lignin and pigment. In the papermaking process, the plant stems (such as straw) after alkaline cooking, and pigments dissolved in alkali lignin, was washed to remove, but a rare addition to clean, which still contains a small amount of pulp lignin and pigment. The lignin and pigment under the action of sunlight and air, and gradually changed, making paper, variable; yellow brittle. ![]() ![]() |
木蟲(chóng) (文壇精英)
木蟲(chóng) (職業(yè)作家)
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It's rare and commendable that you could conserve so many cards for so long a time! I dumped them immediately after their missions. May be I should learn from you, they are really memorable! I suggest you to keep them away from air and light in a container with powerful vaccum effect |
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