Slight yellow tint in my first jar.

[Osse87]

Hello, I had this and attributed to puking when I ran directly from wash, but when I started running from low wines I was surprised it was still apparent. I have checked my SS 304 column and swapped out my SS scrubbers, scrubbers showed no signs of rust, there was something brown inside the column (very small quantity on the walls, not sure if it was rust or something else). My scrubbers are slightly magnetic, they show no signs of rust in a water bath for a few days, neither they show any signs in a solution with citric acid and water for a few days. They did however show signs of rust with oxiclean solution after some time. The rest of the still is copper.

The ball valve of my VM still is brass (NASA treated), and when I removed it to examine there were some concentrated alcohol trapped inside it leaking out, AFAIK I even left the valve open after the run (not 100% sure tho) before I took it apart which made me curious to why there were trapped liquid inside it. I fear this trapped concentrated alcohol over time might be the reason to the tint of the first jar? Could it dissolve the brass over time that is released when I run the still the next time?

If this is the case, do you guys think I need to NASA treat the valve again before I use it in the future and pay attention to not trap any alcohol? I dont want to risk contaminating the product. Thanks for any help.