Oops.........my bad!

Just throw me in with the rest of the uninformed. I stand corrected sir!
Here's what I found with a web search.
The Winchester "Black Talon" was a JHP made by a new process: punching instead of drilling or molding the hollow cavity. At the time it was one of the more advanced JHP designs. A byproduct of its production method was that upon opening in tissue (this is done by hydraulic pressure), the petals folded back and exposed somewhat sharp points. These extended the crushing/tearing diameter of the bullet.
The bullet was coated with black Lubalox and loaded into a nickel case, making it hard to over look. Lubalox is a hard wax blend and was designed to reduce copper fouling in barrels.
The Black Talon was promoted as the best police/defensive ammo of the time, which immediately earned the ire of the gun control special interest groups. Its stand out looks and promotion made it an easy target. The Lubalox coating made some folks wary that it might penetrate body armor, though this was never claimed and tests repeated proved it to be completely false.
The Black Talon was VOLUNTARILY removed from sale after a number of surgeons and other medical personnel expressed concern about getting cut by the bullets when trying to remove them/treat a gunshot victim -- remember, this was near the beginning of the HIV/AIDS problem. It was quietly reintroduced with an improved design and no Lubalox coating and in its current form is still one of the best defensive/police bullets on the market.
The Black Talon WILL NOT penetrate body armor any better than any other bullet of its caliber, weight, and velocity. In fact, as a JHP, it penetrates LESS than standard FMJ "ball" bullets. It will NOT cut through Kevlar. The pointed petals are ONLY exposed after expansion by hydraulic pressure -- impact on hard objects or resistant fiber causes the bullet to plug and flatten instead of expand. Besides, the petals are not very hard and not that sharp.