I debated whether or not to write about this Cyser, but decided to as it makes a good educational lesson about one of the things to look for when you open a bottle that just seems off.
This Cyser has a dark amber colour. When opened, the smell of oxidation is very apparent. Oxidation makes the Cyser look, smell and taste medicinal.
In this case I was not surprised to find this after seeing that it was sealed using a synthetic cork. These types of corks have been on the market for many years and work well for short term storage. However, in my experience, synthetic corks spell trouble for longer term storage.
Bottles, like most types of glass, expand and contract with even slight temperature fluctuations. Synthetic corks don’t expand or contract with the bottle. On the flip side, natural corks do, maintaining an ideal and consistent tight seal between cork and bottle.