I just wanted to share something I found out playing around with my Tren TNT I got from Pareto
So every time I use TNT I heat it up, and I noticed that at the end one of my bottles was really dark compared to a new bottle. So I thought maybe it was the air or heat. So I took 2 bottles brand new and heated one up for 15 minutes, and it got the same result.
When I first got the TNT it was light coloured, and I asked if it was GTG. the rep told me that the colour does not mean much in regards to purity and that factors like exposure to air and heat can modify it. Watching the colour change over 15 minutes was crazy though.
So here you have, 2 exact same bottles, just one is heated for 15 minutes