What is the cooling liquid in automatic ice cream maker bowls?

electric ice cream makers image

stovetop

I made frozen drinks with a rotary electric ice cream/sorbet maker. There was an awful metallic taste in my slushy as I neared the bottom. After cleaning out the metal-lined insulated bowl, I noticed some of the cooling liquid had collected in the bottom. Should I be concerned that I may have ingested a carcinogen or toxin?
It is an insulated bowl that is filled with a clear fluid. Somewhat like a thermos filled with liquid rather than air. The bowl is placed in the freezer to cool. It is then placed on a unit which spins it while a stationary plastic blade stirs the icecream/sorbet/yogurt/etc. Here is the website with the actual product.

http://www.cuisinart.com/catalog/product.php?product_id=45&item_id=82&cat_id=10

Many thanks!
Oh, the liquid/gel evaporated overnight and left a crystalline formation behind. Much like frost on a window. maybe it was ethanol or somesuch... however, there was no appreciable odor, just a bitter taste.

Answer
You need to give some more info. How does it cool? A gel or disk that is put into the freezer or self-cooling (compressor)?