Yes you can. This is one of the few base metal clays, you can fire with a hand torch. However, as oxidation starts with this method immediately after firing, the hot piece must be quenched into the water as quickly as possible. The piece can be pickled with Picklean.
The piece fired by a handheld torch should be maximum the size of a 2 Euro coin.
We recommend firing in two steps in the kiln. Oxidation can only be avoided in a low-oxygen environment in activated charcoal.