Additional file 1 of Different low-cost materials to prevent the alteration induced by formic acid on unstable glasses

Additional file 1: Fig. S1. Distribution inside each desiccator during the (a) First test: selection of the best formic sink, (b) Second test: Optimization of silica gel. Fig. 2. SEM image of (a) the silica gel surface and (b) the deposits formed. Fig. 3. SEM image of the steel (a) before the test and (b) after the test. Table 1. Assignment of FTIR-ATR bands for silica gel.