"Once an object has become a black hole, its going to stay a black hole evan if its gets lighter. <br />All that will happen is the event horizon will pull in until its equal in radius to the singularity."<br /><br />That statement is true for a "mature" black hole, but not necessarily for a "newborn" black hole. In a "mature" black hole, most of the hole is void as the mass concentrates into a singularity at the center. But at the birth of a black hole, the mass necessary to make a black hole of a given radius is going to be distributed fairly evenly across the entire diameter of the black hole. If somehow enough mass could be instantly removed from the black hole, the remaining mass would not be enough to continue to contract (for the reasons that a quark star can't contract into a black hole), and the black hole should reappear as a quark star. But again this would only be possible (assuming that somehow mass could be taken out of the black hole) for a very "short time" after the black hole formed. Because once the mass of the black hole gets sufficiently contracted, taking mass out would only make the radius of the black hole smaller. BTW, I have no idea if a "short time" is nanoseconds, seconds, days, weeks, or months, because I have no idea how quickly mass collapses into a singurality once the event horizon is created in a newborn black hole.