Dem93

I don't think salt sold in Italy has anti-caking agents, it should state it in the ingredients list, but I can't be 100% sure of course. But yeah, I remember many salt brands used it when I lived in the UK, which surprised me because I had never seen it before. And true, it is a crazy amount of salt in so little water. Next time I'll be making such a concentrated salt solution I'll make sure to use glass. An excuse to buy those fancy lab-grade borosilicate glass beakers/flasks. So I can say it has a purpose other than looking cool

Thanks to everyone for your answers, as always things are more complicated than they seem! Thank you for your kind welcoming! Yes, it is a single layer of steel Luckily I didn't add it to all the bottles, but I'd say to a third of them. However as I said at the time of bottling this colour change\reaction wasn't that obvious, it was only when I cleaned it hours later. To play it safe I could dump them and change my procedure next time (using glass I guess) even though that would be a shame Unfortunately in Italy where I'm from it seems almost impossible to find drinkable distilled water. The only type you can find is the one used for ironing or for such appliances and it specifically says it's not for consumption. I've been looking into it because I'm also passionate about tea and coffee and many people are experimenting with the so called "water recipes", starting from distilled and adding minerals in specific ampunts to create a good water profile. And yes, my water has chlorine, but the smell seems to go away from the bottle in a little over a day, the water I used was decanted for a while, not straight from the tap, so I would say very little was left Thanks, this is interesting information!

Hey everyone, I hope the question is not off topic. A few days ago I made a saline solution (45g salt and 180ml of tap water) in a stainless steel pan. This solution was boiled to dissolve the salt and used to add a specific amount of salt to a beer I made, a german style that is traditionally made with salty water. While I was dosing the salt in each bottle I noticed that the solution had turned sligh yellowish, but at first I assumed it was just some salt impurity. However, a few hours after bottling I came back to wash the pan and realized the salt had started to corrode the bottom, and at that point there was some stuff floating and visible areas of corrosion. Now, since I dosed 2-3ml of this solution in each bottle (not all of them though), is this of any health concern? Is it just iron? I used a magnet and it was attracted by the pan, so I guess it is not AISI 312 but rather some ferritic type of stainless steel (it's a cheap pan, single wall thin metal). Thanks to everyone, and please remove if off topic