Identifying PLA vs ABS Filament

[FilamentGuy]

Thanks. As a firefighter, I've smelled enough burning plastic to last me for a while, so I tried the bending method instead.

Bent it completely back on itself and it turned white and didn't break. so ABS.

As a side question, the PLA I have doesn't take well to bending. I tried bending some PLA back on itself and it breaks at around a 90 degree bend. Is ABS that much more flexible than PLA, or is my PLA just brittle?

While PLA does tend to be a little more brittle then ABS, good quality PLA shouldn't break that easily. Check out this video where you can see that's it not all that easy to break a couple strands of PLA filament

If a spool is open for a while the end might get a little brittle, so just cut off a foot or two and it should be fine. If it still breaks easily, it's probably low quality filament.