IMPORTANT UPDATE – Series E nD=1.550 can spontaneously polymerize, causing the liquid to look cloudy and eventually this will cause the liquid to begin gelling. This process is irreversible, but it can be prevented/slowed by storing the liquid at temperatures between 4 – 6oC. If the liquid freezes it must be allowed to thaw at room temperature before use. DO NOT thaw by placing in an oven. If the liquid turns cloudy, DO NOT SHAKE, eventually most of the cloudiness will sink to the bottom of the bottle. The polymerization does not seem to affect the characteristics of the liquid so it is still usable.
