Editing Origami (section)

==Techniques and materials==

===Techniques===
[[File:Origami-Basisfaltungen.png|thumb|right|A list of nine basic origami folds: the valley (or mountain), the pleat, the rabbit ear, the outside reverse, the inside reverse, the crimp, the squash, the sink and the petal]]
{{Main|Yoshizawa–Randlett system}}
Many origami books begin with a description of basic [[Yoshizawa–Randlett system|origami techniques]] which are used to construct the models. This includes simple diagrams of basic folds like valley and mountain folds, pleats, reverse folds, squash folds, and sinks. There are also standard named bases which are used in a wide variety of models, for instance the bird base is an intermediate stage in the construction of the flapping bird.<ref>{{cite book|title=The Practical Illustrated Encyclopaedia of Origami|author=Rick Beech|year=2009|isbn=978-0-7548-1982-0|publisher=Lorenz Books}}</ref> Additional bases are the preliminary base (square base), fish base, waterbomb base, and the frog base.<ref>{{cite book|title=Origami to Astonish and Amuse|author=Jeremy Shafer|year=2001|isbn=0-312-25404-0|publisher=St. Martin's Griffin}}</ref>

===Origami paper===
{{Main|Origami paper}}
[[Image:Orizuru.jpg|thumb|A [[Paper crane|crane]] and papers of the same size used to fold it]]
Almost any laminar (flat) material can be used for folding; the only requirement is that it should hold a crease.

Origami paper, often referred to as "kami" (Japanese for paper), is sold in prepackaged squares of various sizes ranging from 2.5&nbsp;cm (1&nbsp;in) to 25&nbsp;cm (10&nbsp;in) or more. It is commonly colored on one side and white on the other; however, dual coloured and patterned versions exist and can be used effectively for color-changed models. Origami paper weighs slightly less than copy paper, making it suitable for a wider range of models.

Normal copy paper with weights of 70–90 [[Grams per square metre|g/m<sup>2</sup>]] (19–24&nbsp;lb) can be used for simple folds, such as the [[Paper crane|crane]] and waterbomb. Heavier weight papers of
100 g/m<sup>2</sup> (approx. 25&nbsp;[[Grammage#Basis weight|lb]]) or more can be [[wet-folded]]. This technique allows for a more rounded sculpting of the model, which becomes rigid and sturdy when it is dry.

Foil-backed paper, as its name implies, is a sheet of thin foil glued to a sheet of thin paper. Related to this is tissue foil, which is made by gluing a thin piece of tissue paper to kitchen [[aluminium foil]]. A second piece of tissue can be glued onto the reverse side to produce a tissue/foil/tissue sandwich. Foil-backed paper is available commercially, but not tissue foil; it must be handmade. Both types of foil materials are suitable for complex models.

{{Nihongo|[[Washi]]|和紙}} is the traditional origami paper used in Japan. Washi is generally tougher than ordinary paper made from wood pulp, and is used in many traditional arts. Washi is commonly made using fibres from the bark of the gampi tree, the mitsumata shrub (''Edgeworthia papyrifera''), or the [[paper mulberry]] but can also be made using [[bamboo]], [[hemp]], rice, and wheat.

Artisan papers such as unryu, lokta, hanji{{Citation needed|date=August 2013}}, gampi, kozo, saa, and abaca have long fibers and are often extremely strong. As these papers are floppy to start with, they are often [[backcoating|backcoated]] or [[sizing|resized]] with [[methylcellulose]] or wheat paste before folding. Also, these papers are extremely thin and compressible, allowing for thin, narrowed limbs as in the case of insect models.

Paper money from various countries is also popular to create origami with; this is known variously as Dollar Origami, Orikane, and Money Origami.

===Tools===
[[Image:bonefolders.jpg|right|thumb|100px|Bone folders]]
It is common to fold using a flat surface, but some folders like doing it in the air with no tools, especially when displaying the folding.{{citation needed|date=May 2014}}  Some folders believe that no tool should be used when folding.{{citation needed|date=May 2014}}  However a couple of tools can help especially with the more complex models.  For instance a [[bone folder]] allows sharp creases to be made in the paper easily, [[paper clip]]s can act as extra pairs of fingers, and [[tweezer]]s can be used to make small folds.  When making complex models from origami [[crease pattern]]s, it can help to use a [[ruler]] and ballpoint [[Embossing (paper)|embosser]] to score the creases. Completed models can be sprayed so that they keep their shape better, and a spray is needed when wet folding.