Those 7106 and 7107 are still for sale, ordered one about 5 years ago from Conrad to repair a Fluke 8020 (the lcd version) and a few weeks ago I had to replace a led version in a Megger BT51 milliohm meter. They were also used in "universal" panel displays. I used one of those in my ESR meter and an other in a capacitor reformer/leakage tester to read the voltage (for current I used an analog null-meter)
For the contender to the Darwin awards contest, good job, this is the way to go for the first place. Experimenting with this kind of parts without enough knowledge.
You do not want to be near an exploding 10mF cap. But to be fair a good 65V cap probably can blow at twice the voltage but the risk is not as high as people think. Most caps are formed at twice the voltage during manufacturing. If the voltage gets to high and breaks through the oxide layer it will warm up but most times voltage also drops. If this condition stays to long, the temp can go up and then it could pop but most times it ends up as a dead short. It also can fry the electrodes that connect to the pins and in that case become an open. But there is the possibility it gets so hot, so fast that it can blow up. Do not experiment like you did with this kind of parts.
Feeding it with a reversed voltage is very very very dangerous, above the "zener" level of the oxide layer and with acces to enough current it will explodes within seconds.