That stuff is a bit volatile when it gets hot. A JJ's explosion is not fun to deal with.
I opened slowly per directions for years, and then...one time, in the heat of a blistering summer day, I didn't.
It was chartreuse. That was over one year ago. I think I still smell it on my hand, and I know the dude's boat I defiled still proudly displays the evidence of having survived a nuclear attack.