You can play safe and go with picric acid. Or go a little greedy for power and go for ETN but read:
http://www.sciencemadness.org/talk/viewthread.php?tid=22554
http://www.sciencemadness.org/talk/viewthread.php?tid=20582
And I'm sorry I can't post a link for a video that shows how pathetic can ETN be when not set off properly.
Here's micro picric acid test:
http://www.youtube.com/watch?v=hopnxUnyxAQ |