In this area it is 'relative' hard for me to get pure Sodium Chloride. So instead of searching and waiting I decided to just buy the salt from the local store. This kitchensalt includes anti-caking ingredients (E504 and E535). It is eadible and in a low percentage so I just bought it and used it.

Probably not the best choice.

After some research I found out that it actually contains: Sodium ferrocyanide and magnesium carbonate. Furthermore on wiki it says that in acidic environment sodium ferrocyanide set's free cyanide gas. Well that doesn't sound good at all...

I also read in this forum that it potentially could cause a gel to form in the freezing solvent. Well this is actually exactly what is happening. So I am planning on a doing a mini acid/base to clear this up.

But... is this neceassary? Magnesium Carbonat won't go in the solvent as sodium ferrocyanide isn't too... And the gel could be the result of plant fatts. So maybe I am worrying for nothing...?

Anyone knows?