aka corrugated fiberboard
This form of paper is designed to be strong and relatively inflexible. One sheet of paper is rippled between two smooth sheets of paper and glue applied where the ripples touch each outside sheet. Sometimes only one flat sheet is used and the ripples are visible and available for crafting purposes. The rippled paper is usually brown, and the smooth sheets brown or white.
Corrugated cardboard is used extensively for packaging, but that does not mean it cannot be used in paper crafts. Printed corrugated cardboard can be used for the colors it provides as well as the stiffness it brings to a project. Furniture made from corrugated cardboard is often a design project in art classes, and has been produced commercially. A number of artists have explored the use of this material for serious art.
Markers or poster paint can be used to color the edges of corrugated cardboard. Because the paper sides may be relatively thin, water based glues may leave rings or ripples on the smooth sides of the cardboard. This material is rarely acid-free and will stain anything it is in contact with over time.
Folding this board usually take specialized machinery in order to get the fold where you want it. Folding or cutting parallel to the ripples is much easier than perpendicular to them. This is a good material to explore for sculpture, but keep the sculpture inside and away from humidity and sources of flame.
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