I don't understand how you can say that, even if you were to search all non-black objects and none were ravens, this would prove that all ravens are black. It

I don't understand how you can say that, even if you were to search all non-black objects and none were ravens, this would prove that all ravens are black. It also might prove, there aren't any ravens. And, even if you were to find a black raven, it might just mean that you were mistaken and it either wasn't black or wasn't a raven. Thousands of years ago, the Chinese nominalist philosophers built an entire school out of saying, "A white horse is not a horse", and if you read what they said, they were right. You can say, "A white raven is not a raven" but I think you'd be wrong, because it's easy to paint a white raven, especially if you use a dark background. And please, don't tell me, it's the same with a white horse, without reading a bit of Chinese nominalist philosophy. And besides, what is black, actually?