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Rosin Saver was able to observe the deterioration of rosin samples over time by examining the surface structure and lipid content of rosins stored at various humidity levels. Rosin Saver discovered that surface decay occurs rapidly while evaporation of oils and other additives from an entire rosin cake is slow. The decay they observed is significant when considering that string players can only use the rosin surface to apply rosin to their bow hair. Two examples of a well-known brand of violin rosin can be seen on the slides above. The rosin cake was bought straight from the maker and split into tests to guarantee consistency. The rosin was never used, it was only applied to the bow hair. Changes appeared quickly on the sample's surface when it was stored in a very dry environment. A dry, crusty layer of resin was revealed by the evaporation of surface oils and waxes.