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poyoro木蟲(chóng) (文壇精英)
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[交流]
【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)
鐵桿木蟲(chóng) (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 |
銅蟲(chóng) (職業(yè)作家)
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本帖內(nèi)容被屏蔽 |
榮譽(yù)版主 (文學(xué)泰斗)
| 塑料的自然老化 |
塑料老化,是塑料的特性之一。http://bbs.ourplas.cn/read.php?tid=17949 |
鐵桿木蟲(chóng) (著名寫(xiě)手)
金蟲(chóng) (文壇精英)
鐵桿木蟲(chóng) (著名寫(xiě)手)
金蟲(chóng) (職業(yè)作家)
榮譽(yù)版主 (文壇精英)
榮譽(yù)版主 (文壇精英)
木蟲(chóng) (職業(yè)作家)
至尊木蟲(chóng) (文壇精英)
榮譽(yù)版主 (文壇精英)
木蟲(chóng) (職業(yè)作家)
榮譽(yù)版主 (文壇精英)
銅蟲(chóng) (正式寫(xiě)手)
木蟲(chóng) (職業(yè)作家)
榮譽(yù)版主 (文學(xué)泰斗)
至尊木蟲(chóng) (知名作家)
金蟲(chóng) (正式寫(xiě)手)
新蟲(chóng) (正式寫(xiě)手)
木蟲(chóng) (著名寫(xiě)手)
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The reason why the cards fade is that the chemical which was used in the cards to improve the whiteness had been changed or reacted due to the long-term contact with air. Sunlight will obviously accelerate this progress. The same thing would happen to books, white wall, white clothes etc. [ Last edited by wangyeliu on 2011-2-26 at 20:50 ] |
鐵桿木蟲(chóng) (著名寫(xiě)手)
| This time I do not want to talk about the color change. I am concered about the gold coins you left. I think, if you do not distribute them to us, I am afraid that the left gold coins (BBs) may also change their colors in you hands. So i suggest you give it to me more if you like. |
銅蟲(chóng) (正式寫(xiě)手)
木蟲(chóng) (正式寫(xiě)手)
鐵桿木蟲(chóng) (著名寫(xiě)手)
| Your post has been covered by other newly presented posts. And 35 gold conins are still left. So I decide at once to help you to place it on the top of all posts. This is the aim of writing this response. I am sure I do not want to get extra coins this time. I am just as a volunteer and do not ask for money. |
金蟲(chóng) (正式寫(xiě)手)
木蟲(chóng) (著名寫(xiě)手)


[ Last edited by javy023 on 2011-2-25 at 19:33 ]




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