# Paper Review #22: Karaperapisu

There are some benefits for having a Japanese speaking editor. When Jason Ku stayed in Japan for a year, he opened a gateway for me to some incredible Japanese papers. This article, as well as the next five, are dedicated to those papers.

We start with a unique, iridescent paper. Its name, as far as we know, has no real meaning, and it may come from the word "Karape" (カラペ - Ka Ra Pe) which is a shortening of the English term "Color Wrapping Paper". Rapisu has no meaning, but it does roll nicely on your tongue.

It is made and distributed by Takeo, a Japanese producer (with more than 5000 papers in its catalogue!), and packed by Toyo, marked as an origami paper. By the way, on the Takeo site it is referred to as a gift wrapping paper.

It is not good for everything, as it sits in the middle of the low weight group. It is mainly for complex and multi-layered models, so do not look for modulars or simple folding in this article. We were unable to get any official data, so it is all based on our tests.

## Properties

1. A pack of Karaperapisu

Thickness: The paper weighs 42gsm and has a thickness of 71 microns. This puts it in the same category as Unryu, thin Kraft and Onion Skin paper. Unlike the other mentioned papers, it is the only one that is sold as origami paper.
2. Sizes: There's a complete range of sizes - you can find full sheets at 93.9cm × 63.6cm, or pre-cut squares with a side length of 60cm, 40cm, 30.5cm, or 15cm.
3. Colors: 4 colors are available: blue, gold, red, and green.
4. Paper Coloring or Colorability: This paper is not meant for coloring.
5. Texture: One side is black (!), the other has a shiny, glimmering metal finish. The paper is very smooth on both sides.

6. Photogenic: This is a little tricky. The deep colors and the metallic, glimmering texture have great potential. Both the color side and the black reverse have a glimmer that can be a big problem if you do not know how to control your light. It takes a good photographer to bring out its beauty.
7. Aging and Wear and Tear: The paper is weak, almost the weakest paper we have tested - it scored 216/316 in the tear machine, while 40gsm Kraft scored 204/247. The paper tore for two of the three of us while folding. 3 out of 10.
8. Memory: The paper's performance here surprised us. Although the paper is thin, it has great memory. Once you fold it you need to smooth it strongly to flatten the paper again. 9 out of 10.
9. Forgiveness: If you make a sharp crease, you can easily reverse it. You can feel the crease and follow it, just work a little slower than usual. 8 out of 10.
10. Tensile Strength: We refer here to the maximum stress the paper can undergo while being stretched or pulled. On the one hand, the paper is flexible and stretched by 11.7mm before snapping! On the other hand, it can hold only 4kg with the grain, and 2kg against the grain. 4 out of 10.
11. Bending Resistance: This section rates the amount of force you need to apply to get a sharp crease and how strong the paper is while being curved. Since the test machine is in repair, I have no numbers here but a sense of my hand. The medium papers are highly resistant when folded. A bone folder is almost a must. 9 out of 10. The super thin papers are more welcoming, but they are far from being soft, even given their low weight. 7 out of 10.
12. Price group: Expensive - think thoroughly before using – for a best friend's wedding gift.

## Test results

### Tessellation

#### Pineapple tessellation (the extreme version) by Ilan Garibi, 30.5×30.5cm

Collapsing the model worked perfectly.

The extreme version is based on an 8×8 molecule (unlike the 6×6 in the original) and an extra stage in the collapse. This version asks for very thin paper, but with agility and resistance. Karaperapisu is such a thin paper, and yet the first folds reveal that the paper breaks and takes creases like much thicker paper. I folded a 34 by 34 grid and could reverse it with little effort. Only rarely do I miss the existing crease line. I work slowly, sometimes even very slowly, while doing the precreasing. The diagonal folds do not jump into corners, and you have to lead them slowly to place. The black side has very little bump and it is hard to see the crease lines. The collapse is done in three stages, and this is where this paper rocks! It is so thin, yet highly responsive, keeps its shape even when there are many layers, and the paper stays crisp even after a lot of handling.

### Complex

#### Owl by Katsuta Kyohei, 30.5×30.5cm

It was very easy to fold the owl from Karaperapisu.

I could fold the model with this paper very quickly - perhaps my fastest fold of it yet. The paper snaps into place accurately. It was easy to fold the grid as well as all the precreases accurately, and collapsing the base was easier than ever. The paper folds beautifully, and reverses with no effort at all. Truth be told, the talons are usually a big problem, but not this time. Throughout all the open sinks, the paper behaved perfectly. I used tweezers for the final details and the result is highly satisfying.

#### Lyrebird by Satoshi Kamiya, 30.5×30.5cm

Folding the lyrebird was a challenge.

This is the first time I folded the lyrebird. There are many box-pleating moves here and for the first time the paper is a little disappointing. When I fold two to four layers together, I lose accuracy. Inner pleats are much harder to reverse, as required when open sinking back and forth. While pulling aside a layer to reverse it, the paper tore. Another tear formed when I opened the many layers of the wing base. On the plus side, the series of outside-inside reverse folds to create the tail went really well. There is a total of layers of paper, and only few paper types allow manipulating so many layers this easily. To complete the tail, you have to fold a corrugation. I had a lot of issues here. Using the method suggested in the book, it was almost impossible to pull out the wanted layer and to push it back, because of the little tensile strength this paper has. I then tried folding it like a tessellation, but the creases I formed by folding all layers at the same time didn't give me accurate enough crease lines to work with. It was a complete mess. Indeed, this model has steps that you can only easily complete with thin paper, and then other steps where you need some stiffness - which this paper lacks.

### 3D models

#### Wizard by Satoshi Kamiya, 30.5×30.5cm

The paper holds the shape without need for MC.

Precreasing went perfectly. The paper has great memory and it was easy to make the long fold lines in the first steps. I managed to shape the model as I wanted, and the paper held the shape without MC or other help. Surprisingly, even though the stick has many layers, I managed to get it right, too.

#### Dwarf by Eric Joisel, 30.5×30.5cm

You have to work carefully to prevent the paper from tearing.

The paper folds well; I liked the way it reverses and holds the creases and shape. Yes, it is a thin paper, but not thin enough for this model. The hands have so many layers - too many to shape them as I wanted to. Another issue was the weakness - when pulling the paper aside, it easily tears, so I had to work slowly while shaping the beard.

### Our young expert

At the age of fourteen, Ynon Toledano is our special third opinion reviewer.

#### Cicada Nymph and Cyclommatus Metallifer, both by Satoshi Kamiya, 30.5×30.5cm

 A perfect paper for insects.

The paper folds great. It is easy to reverse fold lines, and with both models, the many layers were no obstacle for me. It is good for shaping as well, and I managed to create all small details of the legs. It did tend to break and tear at the edges, and I use just a little MC enforcement at the final stages. All in all it’s a perfect paper for insects, and I really enjoyed it.

## Final verdict

While we had hugely varying opinions in our previous review, we had a complete wall to wall approval here - it is a great paper, especially for complex and 3D models. Even for tessellations it worked fine, thanks to the contrast very thin papers can achieve: only 0.071mm thick, and yet it can hold a crease perfectly.

However, it is not a perfect paper. There is a price to pay here – the paper is weak and will tear if not handled carefully, as it happened to us. Moreover, its texture and the black reverse - although rare and unique - create a problem: you cannot color it and not that many models are suitable for the iridescent look.

In flickr, I found no pictures of models made from it. It is probably because it is not a well known paper. With more and more online stores starting to sell it, I believe this will change soon.

## Why should you buy it?

It is thin, unique in color, and has perfect memory. If you like to fold bugs or complex models, this is the paper for you.

Bottom line: a treasure to be found!

Paper Thickness (gsm) Size Color palette Texture Aging Memory Forgiveness Tensile Strength Bending Resistance Price group
Karaperapisu 42 93.9cm×63.6cm; 15cm, 30.5cm, 40cm, 60cm 4 Iridescent Unknown 9 8 4 4 4
O-Gami ~25, ~85 55.9cm×71.1cm 32 Handmade Many years 9.5/9 9/7 9.5 9/7 5
Clean Room Paper 66 US letter, A3, A4 Limited Smooth Unknown 9.5 9 6 7 3
Efalin 115 70cm×100cm 24 Fine Linen, New Linen, Crash, Smooth Many years 9 8 9.5 7 3
Lokta ~50 varies; e.g. 45cm×45cm, 50cm×65cm Many Handmade Many years 6 7.5 9.5 6 4
Bible 35-50 B1, A4 white Smooth Many years 7 7.5 8.5 6 2
Sato Gami 80 15cm, 35cm, full sheets 6 Rough and Fibery Unknown 9 9 7 8 4
Glassine 40 10cm, 15cm, 20cm, A4, 70×100cm 11 Smooth Unknown 9.5 6 8 4 3
Unryu 27 40cm, 60cm 10 Hand-made Many years 7.5 8 10 5 4
Skytone 90, 176 A4, 63.5cm×96.5cm 12 Smooth, marble-like Unknown 8 9 7 8.5 3
Kami 60 7.5cm, 15cm, 30cm 200+ Smooth, a bit shiny Many years 8 8 7 8 1
Ingres 90 B1, B2, A4 5 (previously 21) Rough Years 8 8 7.5 8.5 2
Nicolas Terry Tissue Foil 50 15cm, 20cm, 30cm, 40cm, 60cm 8 hues Glittery; handmade look Unknown 8 8 9 8 4
Onion Skin 35 A4; Letter; 84.5×64.4cm White Cockled Many years 8 5 8.5 5 2
Kraft 35 15cm; 30cm; 48cm; 35cm; 40×60cm Light brown Smooth and a little shiny on one side Unknown 9 5 8 4 1
Crumpled 48-51 64cm by 64cm 28 hues, plus 12 pearled Bumps Less than a year 8 6 4 4 2
Stardream 110-340 (120 tested) 72cm by 102cm 33 hues Smooth and sparkly Years 9 9 7 9.5 3
Origamido 10-100 40cm by 50cm and more Very broad Varies Many years 5 to 9 6 to 8 10 2 5
Printer Paper 50-120 (80 tested) A0-A7, B and C equivalents, ANSI. Many others Mainly white, but many colors smooth and dull Few years 7 9 4 4 1
Japanese Foil 50 various from 3cm up to 50cm squares 12 colors smooth and shiny Many years 10 4 5 6 1
Tant 78 7.5cm; 15cm; 30.5cm; 35cm; 110×80cm 100 colors Mildly rough Many years 9 8 6 5 2
Elephant Hide 110 A4; 70cm×100cm 7 colors smooth Many years 10 7 10 10 3
Paper Classic Action Tessellation Complex Modular 3D Wet Folding Final score
Karaperapisu n/a n/a 8.5 9 n/a 9 n/a 9
O-Gami n/a n/a 9 8.5 n/a 9 8.5 9-
Clean Room Paper 8 10 9 6 6 10 n/a 8
Efalin 7 9.5 9 5 6 9.5 9 8
Lokta n/a n/a 7 8 n/a 8 n/a 8
Bible 8.5 7.5 8 8.5 6 8 n/a 8
Sato Gami 8 9 9 6 9 8 n/a 8.5
Glassine 8 8.5 9 7 9.5 7 n/a 8
Unryu n/a n/a n/a 9 n/a 9 n/a 9
Skytone 8 8.5 9 9 9 9 8.5 9
Kami 8.5 8 8 7 9 7.5 7.5 8
Ingres 7 8.5 8 7 7 8 8 7.5
Nicolas Terry Tissue Foil 9 8.5 8.5 9.5 8 9 9.5 9+
Onion Skin 8 8 7.5 8.5 6 8 n/a 8
Kraft 8 7 8 9 6 8 n/a 7.5
Crumpled 8 7.5 8.5 8.5 7 8 n/a 8
Stardream 8.5 8.5 9 7.5 7.5 9 9 9
Origamido 8 7.5 7.5 9.5 n/a 9 n/a 9
Printer Paper 7.5 7.5 6 5 6 6.5 n/a 6
Japanese Foil 9 9 6 8 8.5 8 n/a 7
Tant 9 8.5 9 8 9 8 7.5 8
Elephant Hide 8.5 9 10 8 8.5 9.5 9.5 9.5

Actually it's not that expensive. Here (http://www.olshop.origamihouse.jp/item/903425.html) it's only $2.16 (US Dollars). Compared to the other prices, this is the best deal. The others were from$6 up to \$15.