معلومات وثقافة

لماذا تتعرض الاوراق او الكتب القديمة للاصفرار

Encyclopedia of Knowledge

سر اصفرار اوراق الكتب القديمة …
هل سبق وسألتم انفسكم عن سر هذا الاصفرار !!!

إن 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 الكبريت) 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 حمض الكبريت 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 حمض الكبريت مع الورق ينزع منه الماء أى الهيدروجين والأكسجين تاركا الكربون الأسود . وهكذا يبدو الورق كأنه حرق .

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