What is the difference between high tech and black tech?

High-tech is in a certain field, he stands in the high point of science and technology, is in this field, he can not be copied, and he used a variety of instruments and all aspects of the most top of the line, this is high-tech, black technology is in a certain area, he may not use the technology is not the most top of the line, but he is the idea of the most peculiar, can produce unexpected results, which is black technology. This is my personal point of view