Room mate leaves the heater on before and while showering. The room gets quite warm. Wondering if might have degraded the potency?
https://www.e-cigarette-forum.com/forum/blog-entry/effects-of-heat-on-nicotine-degradation.6202/
Seems like heat definitely degrades it, but too many variables in your situation to say exactly how much.
Unfortunately the guy has not excluded two very important factors, which are UV light (why blue bottles? they absorb yellow/orange light!) and air, so we don't know if heat alone degrades nicotine or if it just speeds up degradation initiated by UV light or air in the first place. Another point would be the way he excluded results. You just can't take only values if they fit to the previous ones. This makes it impossible to calculate a standard error for the measurements and it's impossible to know if the finding has statistical significance.
But the most obvious finding is that the first two values (control and 125 °F) are just apart by 0.9 % and that's clearly within the error.
Are black bottles bad to store nic in, since they also absorb heat? I bought one to store my nic in and figured black would be better than clear.
You don't mention for how long. If you're talking about a single incident, it will be insignificant.
A few weeks
The potency might have been slightly degraded, but with such a low concentration it's probably insignificant. If it's still usable is another question, only way to really find out is taste it and see if it's harsh.
New mixer questions belong here.
Delete this post and post your question in the proper thread that I linked.
I wouldn't call this a new mixer question. It not even the typical 'i left juice in my car all day...'