Blow in
A blow in is just what the name suggests - a gather blown into another vessel (usually a cup or a tube).
steps to a blow in:
1) pre heat the vessel which you intend to fill with the gather in the kiln. it is important that it is not sealed on the end with a blow tube so you can blo it in and not trap air..
2) heat the gather you intend to use to fill the vessel until it has a strong heat base.
3) holding the vessel vertical with the opening on the top - carefully insert the gather, so that it does not touch any of the sides, until it is about half way down the vessel.
4) blow into the gather so that it makes contact with the walls of the vessel pushing any trapped air out the bottom blow tube and the top of the opening.
5) remove blow tube from vessel and clean up ends.