How do you find anti-log of-0.0006?

Antilog(-0.0006) = 10-0.0006

This assumes the base is 10 on the grounds that if the base were e, the most common base for mathematics, you would have used ln instead of log. And any other base should always be specified. Since there was none it must be 10.

If not, and the base is x, then the answer is x-0.0006