A raised area, bulge or bubble on the surface of an object, often between adjoining layers of different materials. May be caused by a loss of adhesion between two layers, excessive heat, or pockets of trapped air or liquid.
![](https://aiccm.org.au/wp-content/uploads/2019/10/BubblesNitrateFilm_500.jpg)
A raised area, bulge or bubble on the surface of an object, often between adjoining layers of different materials. May be caused by a loss of adhesion between two layers, excessive heat, or pockets of trapped air or liquid.