With the negative in his enlarger, the artist developed large sheets selectively, pouring on photographic solutions and repeatedly creasing and folding the wet paper.
A broad variety of standardized pipe fittings are available; they are generally broken down into either a tee, an elbow, a branch, a reducer/enlarger, or a wye.
When the operator is satisfied with the arrangement, the photographic material is exposed with light, usually by switching on an enlarger or other artificial light source.