I believe that this piece was fired in a kiln fire. Adam Silverman applied the glaze by pouring/dripping the glaze over the sides and allowing it to run and make the streaks. I really like the contrast between the dark body and oatmeal glaze. It makes the piece stand out. The glazes in our class are very dry, but if we had good glazes, we could probably do this a lot more than we do.
This piece was fired in a naked raku fire. A naked raku fire is when slip is applied to the pot before it is placed in the raku kiln. The slip cracks and breaks apart during the firing and is chipped off after to reveal a blackened crackle pattern. After this, they applied either water colors or very thin glaze so it was see through. I like that you can see through the glazes and the crackling makes it look aged. We could have raku fires, but not at school.