Original sentence: It's very thick
Edited sentence: A solution of sodium silicate is acidified to produce a gelatinous precipitate that is washed, then dehydrated to produce colorless silica gel.This will cause the gel to be blue when dry and pink when hydrated.When a visible indication of the moisture content of the silica gel is required, ammonium tetrachlorocobaltate(II) (NH4)2CoCl4 or cobalt chloride  CoCl2 is added