From Portico 9th March 22

These before and after photos of the sponge used today is a proof that the simple cleaning process, using brush and sponge, really works. Of course, both these brush and sponge are specially made for conservation. The dry cleaning sponge effectively removes soot and smoke from paper,

اسپانج مخصوص برای تمیزکردن دود و دوده از ورق‌ کتاب‌های قدیمی. عکس سمت راست همان اسپانج است بعد از تمیز کردن دو کتاب.