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Pencil
Pencil will work great, it makes a very clean line, a little difficult to erase completely, you can even do a limited amount of smudging.
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Colored Pencil
You will also make a very clean and strong line with colored pencils. You can mix them a little bit on the paper but layering is not possible. Trying to add too much colored pencils will result in the production of little balls of wax and pigment on the paper, as you can see on the picture.
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Watercolor Pencil
Watercolor pencils will work great either dry or wet, they make a wonderful line. Still not possible to layer.
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Felt
Felts work very well, they slide easily on the paper.
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Oil pastels
Very nice to work with on yupo paper, you can try to mix colors a little as shown on the picture, layering still very difficult. Scraffito is very easy and can produce very interesting effects.
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China ink
China ink will produce a very strong contrasting black on the bright white of yupo paper. You can dilute it to obtain different shades of grey, then work it the way you would with other inks, watercolors, or liquid acrylics on yupo paper. They will stain the paper and once dry are very difficult to lift.
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Pastels
Pastels won't adhere on the surface of yupo paper because there is no tooth at all, but if you did build up layers of acrylics and gel medium or if you did some paper collage then you can have enough tooth to use pastels.
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Collage
You can try some paper collage, here I used gel medium to have the paper adhere on the surface and reworked the paper with some purple pastels. You can see the paper lifted in some areas, but I liked the effect.
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Gouache
Gouache works great, it is adhering well to the paper. It will lift up when re-wetted but layering is still possible with a very light hand.
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