Silica gel was 1^st developed for preservation of

Silica gel was 1^st developed for the preservation of Neurospora.
Silica gel is an amorphous and porous form of silicon dioxide (silica), consisting of an irregular tridimensional framework of alternating silicon and oxygen atoms with nanometer-scale voids and pores.
Silica gel is sometimes used as a preservation tool to control relative humidity in museum and library exhibitions and storage.