During the war you could also find these packs in German possesion
10.1105/tpc.110.081356 Plant Cell Summary Keywords arid region, heat stress, Sm-like protein, RNA metabolism, antisense RNA, non-coding RNA, aberrant transcriptions, Arabidopsis Citation Okamoto M, Matsui A, Tanaka M, Morosawa T, Ishida J, Iida K, Mochizuki Y, Toyoda T and Seki M (2016) Sm-Like Protein-Mediated RNA Metabolism Is Required for Heat Stress Tolerance in Arabidopsis
This sticky texture can then make your painting even more susceptible to dirt and exposed to the elements, so becomes even harder to clean as the surface of the painting is no longer dry
Air should flow through smoothly with moderate effort