Have you ever found yourself wondering which side of watercolor paper to use? Maybe you cut up a large sheet into smaller pieces, and now you’re wondering which was the “right” side to paint on? Or if you’ve removed a sheet from a watercolor block or a pad then you’re facing the same problem…
I’ve found myself in this situation a few times. The important question being whether there’s a “correct side of the paper on which you are intended to paint.
So what side of your watercolor paper should you use? Most of the time the answer seems to be “whichever side you like”. The only real difference being a subtle variation in texture. But with that being said, there IS a difference between the two sides of the paper. And this difference varies depending on the brand and type of paper you choose to paint on.
I did a little research to find out what changes you can expect between one side of your paper and the other!
What Side of Watercolor Paper to Use
If you’re asking yourself this question then it probably means there isn’t a huge visual difference between the two sides of your paper. This is true for the majority of good quality 100% cotton papers on the market. The only noticeable difference is a slight change in texture between the two faces.
Of course, the real question we’re asking ourselves is whether there’s a discrepancy in the handling qualities of the “front” and “back” of the sheet.
The two factors which might have an influence on how the paper handles (apart from your choice of weight, surface finish, etc.), are the “tooth” or textural variations and any possible differences in the sizing of the paper sheet.
Sizing is an important feature, especially for watercolor paper. Traditional sizing uses gelatine. Sizing prevents all the color pigments from watercolors from being absorbed deep into the paper, and in this way it preserves the bright color appearance of your paints. Well sized paper also allows wet paint to transfer easily from brush to paper, and remain damp on the surface so you have longer to play with the paint.
Differences between handmade and moldmade watercolor paper
100% cotton paper can either be handmade or moldmade.
To begin with, cotton fibers are mixed with a large amount of water to make paper pulp.
Handmade papers are produced using a rectangular hand-held mold. This is basically a big flat sieve with a wire mesh stretched across a frame. This mold is dipped into a vat of cotton pulp, then sloshed around to spread the pulp evenly over the mesh. The water drains away and the pulp sticks to the wire mesh.
This sheet of pulp is then transferred to a sheet of felt for drying. This wet paper sheet is sandwiched between successive layers of felt (like a big paper and felt lasagna). A big press is used to squeeze out the water and begin the drying process.
The type of felt used is what gives watercolor paper its famous “rough” or “cold press” finish. Smooth “hot press” paper undergoes an additional treatment of being compressed by hot rollers to smooth away the texture.
I’m telling you this so you understand the difference between the two sides of traditionally made watercolor paper. As you have probably guessed, this process can produce two different surfaces to the paper.
The first is the wire side where the pulp adhered to the mold.
And the second is the felt side where the sheet was placed on the felt for drying.
Of course, both sides end up getting squeezed between sheets of felt, which reduces the difference in texture between the “front” and “back” faces. But the impression left by the wire mesh often persists. And the two sides of the paper are referred to as the wire side or the felt side.
With handmade papers this generally means you get a more important difference in surface texture on each side.
For a better idea of how this handmade process works take a look at this quick video which shows the handmade process of Fabriano paper:
Now, handmade papers are pretty expensive (they are more labour intensive than machine made papers). So most of us stick to professional quality 100% cotton paper which is made by machine. This type of paper is what we call moldmade.
Moldmade paper relies on the same method as handmade paper, but to make things easier, the whole process is automated. The sheets of watercolor paper are fabricated as one continuous very long sheet. To do this the wire mesh is in the form of a cylinder mold. This cylinder is dipped into a vat of paper pulp and rotated so that the pulp slowly adheres to the surface of the wire mesh.
The wet sheet of pulp then gets transferred to a sheet of felt, and sandwiched between felts to begin the drying process.
Note that for both handmade and moldmade paper, gelatine sizing of the sheet happens after the paper is formed and dried. The sheets get sent through a vat of liquid sizing which impregnates the cotton with gelatine, or other chemicals depending on the manufacturer.
This manufacturing process results in paper which has a less conspicuous change in texture on each face of the sheet.
So you can compare the two processes, here’s another video, this time showing Fabriano’s moldmade paper production:
So Which Side of your Watercolor Paper do You Use?
Okay… So what can we take away from all this?
The only real difference for most of us will be a slightly different surface finish on the felt side and the wire side of the sheet. Depending on the brand of your paper and the production method used, this variation in texture will be more or less pronounced.
I suggest you experiment to find out which side you prefer.
Paint handles differently on different paper textures. For example smooth hot press paper is good for detail. Slightly textured cold press paper is well suited to a wide variety of painting styles and the texture contributes to the final appearance.
Personally I use Arches paper for my finished paintings (here’s the stuff I buy at Blicks). The difference on cold press paper is very subtle indeed, but over time I’ve come to recognize each side, and I use the “front” sheet as it is presented to me when I open the pad or block.
A quick tip if you buy large sheets and cut them up. Use a pencil to mark the “back” of the sheets with a “B” so you can quickly determine which side is which!
As for sizing, there should be very little divergence between the two faces. In fact, Arches boasts that it is one of the few brands which sizes its paper with gelatine “to the core”
Can you Paint on Both Sides of Watercolor Paper?
By now I’m sure you’ve guessed the answer is yes. It really is a question of personal preference. I’ve found very little difference on both faces of Arches, Winsor & Newton, and Sunders Waterford papers.
I often use both sides for sketching. You get double the value out of each sheet!
Related reading: Best paper for watercolor painting