To avoid problems and damage here is some information for preserving drawings:
’18/50/50′
Store the sheets in acid-free and clean folders, preferably calcium-carbonate buffered
temperature around 18° Celsius
relative air humidity around 50 %
maximum amount of lux for 5 months 50-60 Lumen
store the folders in new boxes, acid-free and preferably calcium-carbonate buffered
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