لماذا تصفر الكتب القديمة !!!!!!

[دائمة الذكر]

لماذا تصفر الكتب القديمة !!!!!! (http://www.naabd.com/vb/go.php?url=http%3A%2F%2Fwww.ibtesama.com%2Fvb%2Fsh owthread-t_155732.html)

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أوراق الكتب والجرائد والمجلات الجديدة ناصعة البياض .. بينما تحولت أوراق الكتب القديمة والمطبوعات العتيقة الى الصفرة .. السبب هو أن الورق يحتوى كميات ضئيلة من الحمض (حمض الكبريتيك) وهذه على مدى السنين تتفاعل ببطء شديد مع ألياف السليولوز فتغطيها .. ويتحول لون الورق من البياض الى الصفرة .. ان ضوء الشمس يسرع هذا التفاعل وقد يميل لون الورق الى البنى ويصبح قصفا سريع التفتت ..


والجدير بالذكر ان حامض الكبريتيك المركز حمض أكال جدا وهو عامل شديد الفاعلية ينزع الماء حتى من المركبات التى تحويه .. فالورق يتألف من السليولوز المادة النباتية المركبة من الكربون والهيدروجين والأكسجين .. فعندما يتفاعل حامض الكبريتيك مع الورق ينزع منه الماء أى الهيدروجين والأكسجين تاركا الكربون الأسود .. وهكذا يبدو الورق كأنه حرق .

منقووووووووول

[أم زيد]

شكرا على المعلومة
بارك الله فيك

[نوركيم]

بارك الله فيك على المعلومة الجميلة

*******
.............

[لونجة بنت السلطان]

حفظك الله
شكرااااااااااا
..............
تحـــــــــــــــــــــياتي

[M!$$ Lùnà]

شكراا على المعلومة القيمة
بارك الله فيك

[ازيرا]

ياااااااااه دايما كنت نسال نفسي ذا السؤال
شكرا اخيتي على المعلومة القيمة
بارك الله فيك

[ساعية الى الجنة]

معلومة قيمة

بارك الله فيك

[سحر الإيمان]

السلام عليكم

هكذا ونحب الكتاب لما يصير لونه اصفر :8:

بارك الله فيك على المعلومة

[دائمة الذكر]

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شكرا اخواتي على المرور اللطيف

[تـقــ الله ــــوى]

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