Polar pure long term storage issue

A few years ago a product called Polar Pure was available, it's a little glass bottle with iodine crystals in it. You would add water in to the bottle and  it would create a iodine solution used for purifying water. It has nice features like a trap for the crystals and temperature sensitive paint dots which indicated how much of iodine solution to add to your water. Unfortunately iodine crystals is also a raw materials for certain drugs and Polar Pure is therefor no longer available.

A great thing about this product is the fact it does not actually expires. If there is still iodine crystals in it, you can still use it. There are a few disadvantages; it wouldn't call the taste 'good' and the iodine evaporates and reacts to the environments. I stored my two bottles double packed in small Ziplocs, then together in a larger Ziploc, in a plastic box, placed in another Ziploc. Here are the result after a year without replacing the ziplocs:

Not only did the iodine effect the ziplocs and plastic box. The epoxy protecting the temperature sensitive dots has also turned dark brown, making the dots invisible. Unfortunately there isn't much I can do about this. If you also have Polar Pure stored somewhere, check them and make sure the iodine is not effecting your other equipment!