Cold Pressed Watercolor paper is the middle ground paper – not too rough and not completely smooth. It is good for most subjects and techniques. Hot Pressed Watercolor Paper paper is great for fine detail where big at washes are not required.
Cold-pressed watercolor paper has a slightly textured surface, somewhere in between rough and hot-pressed paper. It is the paper used most often by watercolor artists because it is good for both not only large areas of wash but also as fine detail.
It is made by pressing through the cold metal rollers. It is thought to be the easiest watercolour paper surface to work on. As one might expect, rough surface paper is the roughest texture paper available. It is pressed between sheets of textured felt during the drying process, which is why it has a felt like texture.
Cold pressed paper is rough paper that has been run through a cold press a second time flattening the texture a little although the texture can remain quite prominent depending on the manufacturer.
Hot pressed is the smoothest watercolour paper and is great for artists looking to render their subjects in fine detail. This paper is popular with illustrators and designers as it gives a flat finish good for reproduction.
In a nutshell, the terms “hot press” and “cold press” refer to the paper's surface finish or texture. Cold pressed paper has a slightly bumpy, textured surface. But hot pressed paper has a smooth surface finish. You will also hear artists talking about the tooth of the paper.
Cold Pressed (CP) and NOT paper denotes that it is not Hot-Pressed. All this means is that the paper goes through cold rollers at some point. These create a medium textured surface, ideal for most painting styles such as gouache, ink and watercolour.
Hot press is more suited to fine detail. It handles ink, pens, and penciled details better than cold press. The smooth surface lends itself to precision. Since the surface is smooth, once the washes, glazes, and layers have dried, the irregularities in the water have an exceptional outcome.
The obvious difference is in the texture. The hot press is smooth with hardly any texture, the cold press has a rougher texture to it and of course the rough is very rough and has an almost a lumpy texture to it.
Cold press paper is ideal for larger paintings with less detail—its texture can be prohibitive when trying to add detail to a smaller piece. It also absorbs water more quickly than hot press paper does, allowing you to blend and play with your colors.
NOT (or cold-pressed)
NOT watercolor paper has a slightly textured surface, somewhere in between rough and hot-pressed paper. It's the paper used most often by watercolor artists.
Cold press juicers use a hydraulic press and take a longer time to extract the juice than traditional juicers. The process is more time and labor-intensive, but it does produce vitamin and nutrient-filled juice without causing oxidization to the fruits.
Watercolor paper for beginners:
I recommend beginning with 140# cold-pressed watercolor paper in either a natural or bright white. 140# paper is very common so it's easy to find and fairly affordable—much more so than heavy-weight paper—but will still hold up well under heavy washes.
transitive verb. : to press without applying heat from an external source cold-pressing olives also : to extract (oil) by cold-pressing.
Expression or cold pressing is commonly used in the production of essential and food oils. The term expression refers to any physical process in which the essential oil glands in the biomass are crushed or broken to release the oil. The resulting oil–water emulsion is typically separated by centrifugation.
GSM is the acronym for 'grams per square meter', and in general about 200gsm paper should be suitable for most watercolor painting. Anything under is likely to buckle and warp when painting heavy washes.
Totally fine for begginers as watercolor painting needs minimum 190 GSM paper.
If you intend to use a lot of water in your watercolour painting, then it's important to stretch your paper before starting to avoid cockling. This is where the sheet wrinkles and forms ridges that are almost impossible to remove.
Watercolor Paper Texture
Watercolor paper falls into three basic textures – Rough, Cold Pressed, sometimes called“ Not” (medium Texture) and Hot Pressed (Smooth Texture). There is no standard for texture so what one manufacturer calls rough may be similar to another manufacturers Cold Pressed.
Cold Pressed paper is often referred to as NOT paper meaning it is "not hot pressed". The surface of a Not (Cold Pressed) paper has a moderate texture or tooth inbetween rough and hot pressed. It is made by taking a rough sheet and pressing it again without the felts.
The texture of the rough surface paper makes the color application effects even more enhanced. It works well for a dry brush technique. So, if you want to add visual interest to your paintings, rough watercolor paper is a perfect choice!
Cold-pressed paper is the exact opposite of hot-pressed paper. The paper consists of loose cellulose fibers that are rolled over with cold metal slab hence the name cold-pressed paper. It is relatively smooth in texture but not as smooth as hot-pressed paper.